Regular-Expressions.info - Regex Tutorial, Examples and Reference ...
Oct 29, 2025 · Unlike most other regex tutorials, the tutorial on this website covers all the popular regular expression flavors, and indicates the differences that you should watch out for.
Regular Expression Tutorial - Learn How to Use Regular Expressions
Oct 29, 2025 · This tutorial teaches you how to create your own regular expressions, starting with the most basic regex concepts and ending with the most advanced and specialized capabilities.
Regular Expression Tutorial Table of Contents
Oct 29, 2025 · This tutorial teaches you how to create your own regular expressions, starting with the most basic regex concepts and ending with the most advanced and specialized capabilities.
Regex Tutorial: Lookahead and Lookbehind Zero-Length Assertions
Oct 29, 2025 · Lookahead and lookbehind, collectively called “lookaround”, are zero-length assertions just like the start and end of line, and start and end of word anchors explained earlier in this tutorial.
Regular Expression Examples
Oct 29, 2025 · Key techniques used in crafting each regex are explained, with links to the corresponding pages in the tutorial where these concepts and techniques are explained in great detail.
Regular Expressions Quick Reference
Oct 29, 2025 · Since the full reference tables cover a variety of regex flavors, this quick reference may have multiple entries for the same syntax with links to different sections in the tutorial if different …
Regex Tutorial: Start and End of String or Line Anchors
Oct 29, 2025 · The tutorial page about the dot already discussed which characters are seen as line break characters by the various regex flavors. This affects the anchors just as much when in multi …
Regex Tutorial: Literal Characters and Special Characters
Oct 29, 2025 · In the regex flavors discussed in this tutorial, there are 12 characters with special meanings: the backslash \, the caret ^, the dollar sign $, the period or dot ., the vertical bar or pipe …
Regex Tutorial: If-Then-Else Conditionals - Regular-Expressions.info
Oct 29, 2025 · The latest versions of all other flavors discussed in this tutorial don’t. They simply let such conditionals always attempt the “else” part. A few flavors changed their minds, though. Python 3.4 …
Regular Expressions Quick Start
Oct 29, 2025 · For detailed information, consult the regular expressions tutorial. Each topic in the quick start corresponds with a topic in the tutorial, so you can easily go back and forth between the two.