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    Regular expressions (RegEx) are sequences of characters that form search patterns. They are used to check if a string contains a specified search pattern, and Python provides a built-in package called re to work with regular expressions.

    Basic Usage

    To use regular expressions in Python, you need to import the re module. Here is an example of how to search a string to see if it starts with "The" and ends with "Spain":

    import re

    txt = "The rain in Spain"
    x = re.search("^The.*Spain$", txt)
    print(x)
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    Common Functions

    The re module offers several functions to work with regular expressions:

    • findall: Returns a list containing all matches.

    • search: Returns a Match object if there is a match anywhere in the string.

    • split: Returns a list where the string has been split at each match.

    • sub: Replaces one or many matches with a string.

    Example of findall Function

    import re

    txt = "The rain in Spain"
    x = re.findall("ai", txt)
    print(x)
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    Example of search Function

    import re

    txt = "The rain in Spain"
    x = re.search("\s", txt)
    print("The first white-space character is located in position:", x.start())
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    Regular Expressions in Python: Basic Syntax
    Dive Into Python
    What is a regex pattern in Python?
    A Reg ular Ex pression (RegEx) is a sequence of characters that defines a search pattern. For example, The above code defines a RegEx pattern. The pattern is: any five letter string starting with a and ending with s. A pattern defined using RegEx can be used to match against a string. Matched? Python has a module named re to work with RegEx.
    programiz.com
  1. Python
    https://docs.python.org › howto › regex.html

    Regular Expression HOWTO — Python 3.14.2 documentation

    2 days ago · Regular expressions (called REs, or regexes, or regex patterns) are essentially a tiny, highly specialized programming language embedded inside Python and made available through the re module.

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  2. W3School
    https://www.w3schools.com › python › python_regex.asp

    Python RegEx - W3Schools

    A RegEx, or Regular Expression, is a sequence of characters that forms a search pattern. RegEx can be used to check if a string contains the specified search pattern.

  3. GeeksForGeeks
    https://www.geeksforgeeks.org › python › regular-expression-python-examples

    Python RegEx - GeeksforGeeks

    Aug 14, 2025 · This Python code uses regular expressions to search for the word "portal" in the given string and then prints the start and end indices of the matched word within the string.

  5. Programiz
    https://www.programiz.com › python-programming › regex

    Python RegEx (With Examples) - Programiz

    In this tutorial, you will learn about regular expressions (RegEx), and use Python's re module to work with RegEx (with the help of examples).

  6. TutorialsPoint
    https://www.tutorialspoint.com › python › python_regular_expressions.htm

    Python - Regular Expressions - Online Tutorials Library

    A regular expression in python is often abbreviated as "regex" or "regexp". This is a sequence of characters used to search for specific patterns within text. It provides a specialized syntax that allows …

  7. Dive Into Python
    https://diveintopython.org › learn › regex › syntax

    Regular Expressions in Python: Basic Syntax

    May 3, 2024 · Regular expressions use a sequence of characters to define a search pattern. Here's a quick overview of some common regex syntax elements in Python: (Dot): Matches any single …

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  9. coderivers.org
    https://coderivers.org › blog › python-regex-examples

    Python Regular Expressions: A Comprehensive Guide with Examples

    Apr 5, 2025 · Regular expressions (regex) are a powerful tool in Python for pattern matching and text manipulation. They allow you to define search patterns that can be used to find, extract, or replace …

  10. Google Developers
    https://developers.google.com › edu › python › regular-expressions

    Python Regular Expressions - Google Developers

    Jul 23, 2024 · Regular expressions are a powerful language for matching text patterns. This page gives a basic introduction to regular expressions themselves sufficient for our Python exercises and...

  11. PYnative
    https://pynative.com › python › regex

    Regular Expression in Python - PYnative

    Jul 27, 2021 · We will start this tutorial by using the RE module, a built-in Python module that provides all the required functionality needed for handling patterns and regular expressions. Type import re at the …

  12. TutorialsTeacher.com
    https://www.tutorialsteacher.com › python › regex-in-python

    Regular Expressions in Python - TutorialsTeacher.com

    Different functions in Python's re module use raw string as an argument. A normal string, when prefixed with 'r' or 'R' becomes a raw string. rawstr = r'Hello! How are you?' print(rawstr) #Hello! How are you?

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