Blog
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Regex Cheatsheet: Quick Reference for Regular Expressions
A complete regex cheatsheet: character classes, quantifiers, anchors, groups, lookaheads, flags, and common patterns for Python, JavaScript, and PCRE.
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Regex Tutorial: Learn Regular Expressions from Scratch
A beginner's regex tutorial covering literals, character classes, quantifiers, anchors, groups, and flags with examples in Python, JavaScript, and the command line.
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Regex Groups and Capturing: How to Extract Data with Parentheses
Learn how regex capturing groups work: numbered groups, named groups, non-capturing groups, backreferences, and how to extract data in Python and JavaScript.
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How to Use Regex: Practical Guide to Regular Expressions
Learn how to use regex for searching, extracting, replacing, and validating text. Covers Python re, JavaScript RegExp, grep, sed, and VS Code regex search.
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Regex Lookahead and Lookbehind: Zero-Width Assertions Explained
Learn regex lookahead and lookbehind assertions: positive/negative variants, how they match without consuming characters, and practical examples in Python and JavaScript.
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Regex Email Validation: Patterns, Limitations, and Best Practices
Learn email validation regex patterns in Python, JavaScript, PHP, and SQL. Understand why regex can't fully validate emails and what to use instead.