A RegEx, or Regular Expression, is a character sequence that defines a search pattern. RegEx can be used to determine whether or not a string contains the specified search pattern.

RegEx Module in Python

Regular Expressions can be worked with using a built-in Python library called re.

Import the re module:

import re

Use of RegEx in Python

The RegEx in Python can be used once you have imported the re module.

Example:

import re

txt = "The rain in Spain"

x = re.search("^The.*Spain$", txt)