Re库的基本使用

深藏阁楼爱情的钟 2021-12-21 09:19 211阅读 0赞

## 一、常用方法： ##

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## 二、实例 ##

import re
    repx = re.compile(r'((25[0-5]|2[0-4]\d|1\d{2}|\d?\d)\.){3}(25[0-5]|2[0-4]\d|1\d{2}|\d?\d)')
    match = repx.search('A的ip 255.243.198.1')
    print(match.group(0))
    match1 = re.match(r'[1-9]\d{5}', '100081SKH')#要注意match是字符串的开始位置匹配 若开始位置没有就匹配不到
    if match1:
        print(match1.group(0))
    else:
        print('Match Filed')
    list1 = repx.findall('A的ip 198.254.18.123 B的ip 253.222.111.96' )
    for i in list1:
       print(i)
    for i in repx.finditer('A的ip 198.254.18.123 B的ip 253.222.111.96'):
        #每个i都是一个match对象
        print(i.group(0))
    str = re.sub(r'[1-9]\d{5}', 'RUSHSKH', 'BIOT100081')#返回字符串
    print(str)
    '''
    贪婪匹配和最小匹配
    python的re默认为贪婪匹配 即匹配最大长度
    '''
    match2 = re.search(r'PY.*N', 'PYDSDSNDSDNDSDSDSAN')#贪婪匹配
    print(match2.group(0))#PYDSDSNDSDNDSDSDSAN
    match3 = re.search(r'PY.*?N', 'PYDSDSNDSDNDSDSDSAN')
    print(match3.group(0))#PYDSDSN

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