正则表达式语法

深碍√TFBOYSˉ_ 2022-07-24 08:15 241阅读 0赞

<table style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif; border-collapse:collapse; margin-bottom:20px; margin-top:20px; word-break:break-word; border:1px solid rgb(187,187,187); color:rgb(0,0,0); font-size:13px; line-height:17.55px"> 
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 <th style="padding:10px 8px; color:rgb(99,99,99); border:1px solid rgb(187,187,187); font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; background-color:rgb(237,237,237)"> 字符</th> 
 <th style="padding:10px 8px; color:rgb(99,99,99); border:1px solid rgb(187,187,187); font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; background-color:rgb(237,237,237)"> 说明</th> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \ </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 将下一字符标记为特殊字符、文本、反向引用或八进制转义符。例如，“n”匹配字符“n”。“\n”匹配换行符。序列“\\”匹配“\”，“\(”匹配“(”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> ^ </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配输入字符串开始的位置。如果设置了&nbsp;RegExp&nbsp;对象的&nbsp;Multiline&nbsp;属性，^ 还会与“\n”或“\r”之后的位置匹配。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> $ </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配输入字符串结尾的位置。如果设置了&nbsp;RegExp&nbsp;对象的&nbsp;Multiline&nbsp;属性，$ 还会与“\n”或“\r”之前的位置匹配。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> * </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 零次或多次匹配前面的字符或子表达式。例如，zo* 匹配“z”和“zoo”。* 等效于 {0,}。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> + </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 一次或多次匹配前面的字符或子表达式。例如，“zo+”与“zo”和“zoo”匹配，但与“z”不匹配。+ 等效于 {1,}。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> ? </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 零次或一次匹配前面的字符或子表达式。例如，“do(es)?”匹配“do”或“does”中的“do”。? 等效于 {0,1}。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> { n} </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> n&nbsp;是非负整数。正好匹配&nbsp;n&nbsp;次。例如，“o{2}”与“Bob”中的“o”不匹配，但与“food”中的两个“o”匹配。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> { n,} </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> n&nbsp;是非负整数。至少匹配&nbsp;n&nbsp;次。例如，“o{2,}”不匹配“Bob”中的“o”，而匹配“foooood”中的所有 o。“o{1,}”等效于“o+”。“o{0,}”等效于“o*”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> { n,m} </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> M&nbsp;和&nbsp;n&nbsp;是非负整数，其中&nbsp;n&nbsp;&lt;=&nbsp;m。匹配至少&nbsp;n&nbsp;次，至多&nbsp;m&nbsp;次。例如，“o{1,3}”匹配“fooooood”中的头三个 o。'o{0,1}' 等效于 'o?'。注意：您不能将空格插入逗号和数字之间。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> ? </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 当此字符紧随任何其他限定符（*、+、?、{ n}、{ n,}、{ n,m}）之后时，匹配模式是“非贪心的”。“非贪心的”模式匹配搜索到的、尽可能短的字符串，而默认的“贪心的”模式匹配搜索到的、尽可能长的字符串。例如，在字符串“oooo”中，“o+?”只匹配单个“o”，而“o+”匹配所有“o”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> . </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配除“\n”之外的任何单个字符。若要匹配包括“\n”在内的任意字符，请使用诸如“[\s\S]”之类的模式。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> (pattern) </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;pattern&nbsp;并捕获该匹配的子表达式。可以使用&nbsp;$0…$9&nbsp;属性从结果“匹配”集合中检索捕获的匹配。若要匹配括号字符 ( )，请使用“$”或者“$”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> (?:pattern) </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;pattern&nbsp;但不捕获该匹配的子表达式，即它是一个非捕获匹配，不存储供以后使用的匹配。这对于用“or”字符 (|) 组合模式部件的情况很有用。例如，'industr(?:y|ies) 是比 'industry|industries' 更经济的表达式。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> (?=pattern) </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 执行正向预测先行搜索的子表达式，该表达式匹配处于匹配&nbsp;pattern&nbsp;的字符串的起始点的字符串。它是一个非捕获匹配，即不能捕获供以后使用的匹配。例如，'Windows (?=95|98|NT|2000)' 匹配“Windows 2000”中的“Windows”，但不匹配“Windows 3.1”中的“Windows”。预测先行不占用字符，即发生匹配后，下一匹配的搜索紧随上一匹配之后，而不是在组成预测先行的字符后。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> (?!pattern) </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 执行反向预测先行搜索的子表达式，该表达式匹配不处于匹配&nbsp;pattern&nbsp;的字符串的起始点的搜索字符串。它是一个非捕获匹配，即不能捕获供以后使用的匹配。例如，'Windows (?!95|98|NT|2000)' 匹配“Windows 3.1”中的 “Windows”，但不匹配“Windows 2000”中的“Windows”。预测先行不占用字符，即发生匹配后，下一匹配的搜索紧随上一匹配之后，而不是在组成预测先行的字符后。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> x|y </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;x&nbsp;或&nbsp;y。例如，'z|food' 匹配“z”或“food”。'(z|f)ood' 匹配“zood”或“food”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> [xyz] </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 字符集。匹配包含的任一字符。例如，“[abc]”匹配“plain”中的“a”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> [^xyz] </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 反向字符集。匹配未包含的任何字符。例如，“[^abc]”匹配“plain”中的“p”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> [a-z] </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 字符范围。匹配指定范围内的任何字符。例如，“[a-z]”匹配“a”到“z”范围内的任何小写字母。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> [^a-z] </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 反向范围字符。匹配不在指定的范围内的任何字符。例如，“[^a-z]”匹配任何不在“a”到“z”范围内的任何字符。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \b </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配一个字边界，即字与空格间的位置。例如，“er\b”匹配“never”中的“er”，但不匹配“verb”中的“er”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \B </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 非字边界匹配。“er\B”匹配“verb”中的“er”，但不匹配“never”中的“er”。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \cx </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;x&nbsp;指示的控制字符。例如，\cM 匹配 Control-M 或回车符。x&nbsp;的值必须在 A-Z 或 a-z 之间。如果不是这样，则假定 c 就是“c”字符本身。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \d </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 数字字符匹配。等效于 [0-9]。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \D </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 非数字字符匹配。等效于 [^0-9]。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \f </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 换页符匹配。等效于 \x0c 和 \cL。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \n </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 换行符匹配。等效于 \x0a 和 \cJ。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \r </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配一个回车符。等效于 \x0d 和 \cM。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \s </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配任何空白字符，包括空格、制表符、换页符等。与 [&nbsp;\f\n\r\t\v] 等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \S </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配任何非空白字符。与 [^&nbsp;\f\n\r\t\v] 等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \t </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 制表符匹配。与 \x09 和 \cI 等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \v </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 垂直制表符匹配。与 \x0b 和 \cK 等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \w </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配任何字类字符，包括下划线。与“[A-Za-z0-9_]”等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \W </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 与任何非单词字符匹配。与“[^A-Za-z0-9_]”等效。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \xn </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;n，此处的&nbsp;n&nbsp;是一个十六进制转义码。十六进制转义码必须正好是两位数长。例如，“\x41”匹配“A”。“\x041”与“\x04”&amp;“1”等效。允许在正则表达式中使用 ASCII 代码。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \num </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;num，此处的&nbsp;num&nbsp;是一个正整数。到捕获匹配的反向引用。例如，“(.)\1”匹配两个连续的相同字符。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \n </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 标识一个八进制转义码或反向引用。如果 \n&nbsp;前面至少有&nbsp;n&nbsp;个捕获子表达式，那么&nbsp;n&nbsp;是反向引用。否则，如果&nbsp;n&nbsp;是八进制数 (0-7)，那么&nbsp;n&nbsp;是八进制转义码。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \nm </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 标识一个八进制转义码或反向引用。如果 \nm&nbsp;前面至少有&nbsp;nm&nbsp;个捕获子表达式，那么&nbsp;nm&nbsp;是反向引用。如果 \nm&nbsp;前面至少有&nbsp;n&nbsp;个捕获，则&nbsp;n&nbsp;是反向引用，后面跟有字符&nbsp;m。如果两种前面的情况都不存在，则 \nm&nbsp;匹配八进制值&nbsp;nm，其中&nbsp;n&nbsp;和&nbsp;m&nbsp;是八进制数字 (0-7)。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \nml </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 当&nbsp;n&nbsp;是八进制数 (0-3)，m&nbsp;和&nbsp;l&nbsp;是八进制数 (0-7) 时，匹配八进制转义码&nbsp;nml。 </td> 
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 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> \un </td> 
 <td style="font-family:'Microsoft YaHei UI','Microsoft YaHei',SimSun,'Segoe UI','Lucida Grande',Verdana,Arial,Helvetica,sans-serif!important; padding:10px 8px; color:rgb(42,42,42); vertical-align:top; min-width:80px; border:1px solid rgb(187,187,187)"> 匹配&nbsp;n，其中&nbsp;n&nbsp;是以四位十六进制数表示的 Unicode 字符。例如，\u00A9 匹配版权符号 (©)。 </td> 
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</table>