Regex

Test and debug regular expressions across PCRE, JavaScript, and Python flavors. See matches highlighted, capture groups extracted, and quantifier behavior explained.

All Regex

• Regex Tester Test regular expressions against text. PCRE, JavaScript, and Python flavors.
• Regex Explainer Break down a regex into plain English. Explains each token, group, quantifier.
• Regex Cheatsheet Searchable reference of regex syntax: classes, quantifiers, lookarounds, flags.
• Regex from Examples Paste examples of strings to match; get a regex that matches them all.
• Regex Replace Tester (Live, with Capture Groups) Test regex find + replace with capture group references ($1, $&). Live preview, all flags.