Regular expressions and the use of Python Re library

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Regular expressions and the use of Python Re library

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Regular Expressions

Common operators of regular expressions

Regular expression syntax examples

Regular expression in the form of IP address string

Usage of Python Re library

Regular expression Expression type

When the regular expression contains escape characters, use raw string

Main functions of Re library

Example

import re
match = re.match(r'[1 - 9]\d{5}','BIT 100081')
print(match.group(0))# match 函数从一个字符串的开始位置起匹配正则表达式，所以变量 match 应该等于 # None，所以上述代码会抛异常，正确的写法是先对 match 进行判断

Another equivalent usage of Re library

pat is a regular expression object compiled from the regular expression string form. You can directly use the above 6 functions of the Re library.

Re library match object

Attributes of match object

Greedy matching and minimum matching of Re library

Re library uses greedy matching by default, that is, output Match the longest string

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