Regular Expression Explainer
UtilitiesFree online regex explanation tool. Explains regex pattern segment by segment, helps understand and learn regular expressions.
TL;DR:Free regex explainer that breaks down regex syntax segment by segment with annotations. Supports lookarounds and named groups, runs locally.
FAQ
Completely free, no registration required. Explain regular expression meanings directly in your browser — all operations run locally with no usage limits.
It supports character classes, quantifiers, anchors, groups, backreferences, zero-width assertions (lookahead/lookbehind), named capture groups, and more — breaking down each segment with human-readable annotations.
No. All regex parsing runs locally in your browser. Your patterns are never sent to any server.
regex-explainer focuses on understanding — breaking down an existing regex into human-readable explanations. regex-tester focuses on verification — validating match results against test strings. Use both together: explainer to understand, tester to verify.