Python re.search() Tutorial: Pattern Matching

Search for a pattern within a string using optional flags.

The re.search() function is used to search for the first occurrence of a specified regular expression pattern within a string. If a match is found, it returns a match object; otherwise it returns None.

parameter

1. regular expression
2. string: string to be matched
3. flags: optional parameter used to control the matching behavior of regular expressions, such as whether to differentiate between uppercase and lowercase letters, or to enable multi-line matching.

Return value:

1. If a match is successful, it returns a Match Object that you can use the group() method to obtain the matching string, and also use the start() and end() methods to get the starting and ending positions of the match.
2. If the match fails, return a None object.