---
title: "Regular expressions"
slug: "what-should-i-know-about-regular-expressions-1"
updated: 2025-03-12T18:25:12Z
published: 2025-03-12T18:25:12Z
canonical: "help.mozenda.com/what-should-i-know-about-regular-expressions-1"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mozenda.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Regular expressions

A *regular expression* is an encoded way of representing a pattern in text and is a go-to tool for text processing. Regular expressions are an important part of the automated extraction of information from websites.

If you’re not familiar with regular expressions, learning to use them can be a little intimidating, but the rewards are well worth it.

You can find general how-to's and uses for regular expression in this help, but there are plenty of resources out there to help you get more information.

## Printed resources

Introducing Regular Expressions [http://shop.oreilly.com/product/0636920012337.do](http://shop.oreilly.com/product/0636920012337.do)

Beginning Regular Expressions [http://shop.oreilly.com/product/9780764574894.do](http://shop.oreilly.com/product/9780764574894.do)

## Digital resources

[regular-expressions.info](http://regular-expressions.info)

The Best of Fluent: Regular Expressions Explained: Demystifying Regular Expressions [http://www.oreilly.com/pub/e/2597](http://www.oreilly.com/pub/e/2597)

Fun with Regular Expressions [http://archive.oreilly.com/oreillyschool/courses/asac4/asac411.html](http://archive.oreilly.com/oreillyschool/courses/asac4/asac411.html)