正则表达式全部符号解释 冷不防 2022-06-08 03:21 174阅读 0赞 [**正则表达式全部符号解释**][Link 1] <table style="border-collapse:collapse; table-layout:fixed; white-space:nowrap; width:0px"> <tbody> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">字符</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">描述</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">将下一个字符标记为一个特殊字符、或一个原义字符、或一个 向后引用、或一个八进制转义符。例如,'n' 匹配字符 "n"。'\n' 匹配一个换行符。序列 '\\' 匹配 "\" 而 "\(" 则匹配 "("。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">^</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配输入字符串的开始位置。如果设置了 RegExp 对象的 Multiline 属性,^ 也匹配 '\n' 或 '\r' 之后的位置。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">$</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配输入字符串的结束位置。如果设置了RegExp 对象的 Multiline 属性,$ 也匹配 '\n' 或 '\r' 之前的位置。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">*</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配前面的子表达式零次或多次。例如,zo* 能匹配 "z" 以及 "zoo"。* 等价于{0,}。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">+</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配前面的子表达式一次或多次。例如,'zo+' 能匹配 "zo" 以及 "zoo",但不能匹配 "z"。+ 等价于 {1,}。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">?</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配前面的子表达式零次或一次。例如,"do(es)?" 可以匹配 "do" 或 "does" 中的"do" 。? 等价于 {0,1}。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">{n}</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">n 是一个非负整数。匹配确定的 n 次。例如,'o{2}' 不能匹配 "Bob" 中的 'o',但是能匹配 "food" 中的两个 o。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">{n,}</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">n 是一个非负整数。至少匹配n 次。例如,'o{2,}' 不能匹配 "Bob" 中的 'o',但能匹配 "foooood" 中的所有 o。'o{1,}' 等价于 'o+'。'o{0,}' 则等价于 'o*'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">{n,m}</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">m 和 n 均为非负整数,其中n <= m。最少匹配 n 次且最多匹配 m 次。例如,"o{1,3}" 将匹配 "fooooood" 中的前三个 o。'o{0,1}' 等价于 'o?'。请注意在逗号和两个数之间不能有空格。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">?</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">当该字符紧跟在任何一个其他限制符 (*, +, ?, {n}, {n,}, {n,m}) 后面时,匹配模式是非贪婪的。非贪婪模式尽可能少的匹配所搜索的字符串,而默认的贪婪模式则尽可能多的匹配所搜索的字符串。例如,对于字符串 "oooo",'o+?' 将匹配单个 "o",而 'o+' 将匹配所有 'o'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">.</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配除 "\n" 之外的任何单个字符。要匹配包括 '\n' 在内的任何字符,请使用象 '[.\n]' 的模式。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">(pattern)</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 pattern 并获取这一匹配。所获取的匹配可以从产生的 Matches 集合得到,在VBScript 中使用 SubMatches 集合,在JScript 中则使用 $0…$9 属性。要匹配圆括号字符,请使用 '\(' 或 '\)'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">(?:pattern)</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 pattern 但不获取匹配结果,也就是说这是一个非获取匹配,不进行存储供以后使用。这在使用 "或" 字符 (|) 来组合一个模式的各个部分是很有用。例如, 'industr(?:y|ies) 就是一个比 'industry|industries' 更简略的表达式。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">(?=pattern)</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">正向预查,在任何匹配 pattern 的字符串开始处匹配查找字符串。这是一个非获取匹配,也就是说,该匹配不需要获取供以后使用。例如,'Windows (?=95|98|NT|2000)' 能匹配 "Windows 2000" 中的 "Windows" ,但不能匹配 "Windows 3.1" 中的 "Windows"。预查不消耗字符,也就是说,在一个匹配发生后,在最后一次匹配之后立即开始下一次匹配的搜索,而不是从包含预查的字符之后开始。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">(?!pattern)</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">负向预查,在任何不匹配 pattern 的字符串开始处匹配查找字符串。这是一个非获取匹配,也就是说,该匹配不需要获取供以后使用。例如'Windows (?!95|98|NT|2000)' 能匹配 "Windows 3.1" 中的 "Windows",但不能匹配 "Windows 2000" 中的 "Windows"。预查不消耗字符,也就是说,在一个匹配发生后,在最后一次匹配之后立即开始下一次匹配的搜索,而不是从包含预查的字符之后开始</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">x|y</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 x 或 y。例如,'z|food' 能匹配 "z" 或 "food"。'(z|f)ood' 则匹配 "zood" 或 "food"。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">[xyz]</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">字符集合。匹配所包含的任意一个字符。例如, '[abc]' 可以匹配 "plain" 中的 'a'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">[^xyz]</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">负值字符集合。匹配未包含的任意字符。例如, '[^abc]' 可以匹配 "plain" 中的'p'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">[a-z]</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">字符范围。匹配指定范围内的任意字符。例如,'[a-z]' 可以匹配 'a' 到 'z' 范围内的任意小写字母字符。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">[^a-z]</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">负值字符范围。匹配任何不在指定范围内的任意字符。例如,'[^a-z]' 可以匹配任何不在 'a' 到 'z' 范围内的任意字符。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\b</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个单词边界,也就是指单词和空格间的位置。例如, 'er\b' 可以匹配"never" 中的 'er',但不能匹配 "verb" 中的 'er'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\B</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配非单词边界。'er\B' 能匹配 "verb" 中的 'er',但不能匹配 "never" 中的 'er'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\cx</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配由 x 指明的控制字符。例如, \cM 匹配一个 Control-M 或回车符。x 的值必须为 A-Z 或 a-z 之一。否则,将 c 视为一个原义的 'c' 字符。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\d</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个数字字符。等价于 [0-9]。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\D</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个非数字字符。等价于 [^0-9]。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\f</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个换页符。等价于 \x0c 和 \cL。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\n</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个换行符。等价于 \x0a 和 \cJ。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\r</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个回车符。等价于 \x0d 和 \cM。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\s</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配任何空白字符,包括空格、制表符、换页符等等。等价于 [ \f\n\r\t\v]。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\S</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配任何非空白字符。等价于 [^ \f\n\r\t\v]。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\t</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个制表符。等价于 \x09 和 \cI。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\v</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配一个垂直制表符。等价于 \x0b 和 \cK。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\w</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配包括下划线的任何单词字符。等价于'[A-Za-z0-9_]'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\W</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配任何非单词字符。等价于 '[^A-Za-z0-9_]'。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\xn</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 n,其中 n 为十六进制转义值。十六进制转义值必须为确定的两个数字长。例如,'\x41' 匹配 "A"。'\x041' 则等价于 '\x04' & "1"。正则表达式中可以使用 ASCII 编码。.</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\num</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 num,其中 num 是一个正整数。对所获取的匹配的引用。例如,'(.)\1' 匹配两个连续的相同字符。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\n</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">标识一个八进制转义值或一个向后引用。如果 \n 之前至少 n 个获取的子表达式,则 n 为向后引用。否则,如果 n 为八进制数字 (0-7),则 n 为一个八进制转义值。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\nm</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">标识一个八进制转义值或一个向后引用。如果 \nm 之前至少有 nm 个获得子表达式,则 nm 为向后引用。如果 \nm 之前至少有 n 个获取,则 n 为一个后跟文字 m 的向后引用。如果前面的条件都不满足,若 n 和 m 均为八进制数字 (0-7),则 \nm 将匹配八进制转义值 nm。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\nml</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">如果 n 为八进制数字 (0-3),且 m 和 l 均为八进制数字 (0-7),则匹配八进制转义值 nml。</span> </div> </td> </tr> <tr style="height:40px"> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">\un</span> </div> </td> <td style="font-size:14px; color:rgb(57,57,57); border:1px solid rgb(167,167,167); overflow:hidden; vertical-align:middle; word-wrap:break-word; text-align:center; white-space:pre-wrap"> <div> <span style="font-family:Microsoft YaHei,STXihei; font-size:14px; color:#000000; background-color:transparent; font-weight:normal; font-style:normal; text-decoration:none">匹配 n,其中 n 是一个用四个十六进制数字表示的 Unicode 字符。例如, \u00A9 匹配版权符号 (?)。</span> </div> </td> </tr> </tbody> </table> [Link 1]: http://www.cnblogs.com/yirlin/archive/2006/04/12/373222.html
还没有评论,来说两句吧...