regular expression

Regular expression online verification ：https://regex101.com

Regular expressions = Ordinary character + Special characters

Special characters ：

        .： Match any single character except line feed

        *： Match the previous subexpression any number of times ( Include 0 Time )

        +： Match previous subexpression one or more times

        \： Escapes special characters

        \d{m,n}： Match the Numbers m~n Time , Equate to [0-9]{m~n}

        \D： Match non numeric characters , Equate to [^0-9]

        ?： As few matches as possible , Just once

        \s： Match any blank character ( Space 、tab、 A newline )

        \S： Match any character that is not a space character

        \w： Match any text character ( Letter 、 Numbers 、 Underline )

        \W： Match any non literal character ( Punctuation 、 Space )

        []： Match any one of several characters

        ^： Indicates the beginning of the text , Also means non

        $： Indicates the end position of the text

        ()： Packet matching

Example 1：

        Content ： Salary is 10-16k*16 pay , Dongcheng District, Beijing

        expression ：\d+-\d+k[\*\d pay ]*

         result ：10-16k*16 pay

Group matching example ：

import re
content = """
16788888888 my cellphone number 1111
12566666666 my cellphone number 1111
13577777777 my cellphone number 1111
"""

re = re.compile("(\d+) my cellphone number (\d+)")
def get_value():
    for one in re.findall(content):
        print(one)

if __name__ == '__main__':
    get_value()

result ：

('16788888888', '1111')
('12566666666', '1111')
('13577777777', '1111')