Test, validate, and debug Regular Expressions with real-time match highlighting, group inspector, and replace mode.
Container otimizado com zero impacto no Core Web Vitals (CLS = 0)
Technical architecture and practical engineering workflows
Regular Expressions (RegEx) are powerful patterns used for text search, validation, and string manipulation. This tool executes native JavaScript RegExp algorithms directly in your browser with zero latency.
It automatically segments the test string, color-highlights matching ranges, extracts capture groups ($1, $2), and allows live replacement testing without sending any payload to remote servers.
Type your regular expression and toggle flags (g, i, m, s, u).
Paste your sample string to see matching segments highlighted in real-time.
View match positions, capture groups, and test string replacements with 1 click.
Frequently asked technical questions and specs
Container otimizado com zero impacto no Core Web Vitals (CLS = 0)