All tools
Testers
3 free testers that run entirely in your browser. Test and validate patterns. Nothing is uploaded and nothing is stored.
Regex Tester
Test, replace, and explain regular expressions with live highlighting and named groups.
Diff Checker
Compare text with line-level and word-level diff, collapsible sections, and patch export.
Cron Expression Parser
Parse cron expressions with human-readable descriptions and next execution times.