Python (All) Re functions: Compile, match, search, FindAll

A regular expression is a special sequence of characters that can help you easily check whether a string matches a pattern.

Python has added the RE module since version 1.5, which provides a Perl-style regular expression pattern.

The RE module enables the Python language to have all the regular expression functionality.

The compile function generates a regular expression object based on a pattern string and an optional flag parameter. The object has a series of methods for regular expression matching and substitution.

The RE module also provides functions that are fully consistent with these methods, which use a pattern string as their first parameter.

Parameter description:

Function parameter Description:

Parameters	Description
Pattern	Matched regular Expressions
String	The string to match.
Flags	A flag bit that controls how regular expressions are matched, such as case sensitivity, multiline matching, and so on.

Re.match function:

The match attempts to match a pattern from the starting position of the string, and if the match is not successful, match () returns none.

function syntax: re. Match(pattern, string, flags=0)

Match result: Re.match match succeeds returns an object, otherwise none is returned.

Use Group (num=0) or groups () to get matching results

Re.search function:

Scans the entire string and returns the first successful match.

function syntax:re. Search(pattern, string, flags=0)

Parameters above

Match result: Returns a matching object if the match succeeds, otherwise none is returned.

Use Group (num=0) or groups () to get the result of the match.

Re.findall function:

Scans the entire string and returns the matching content as a list .

function syntax: Re. Search(pattern, string, flags=0)

Python (All) Re functions: Compile, match, search, FindAll