Loading your tools...
Loading your tools...
Debug pattern behavior quickly with real-time matching and practical test input.
Loading Tool...
Enter your pattern in the regex field.
Add test text to evaluate matches.
Toggle flags such as global or case-insensitive mode.
Review matches and capture groups, then refine the pattern.
Form input validation patterns
Log parsing and text extraction
Search and replace rule design
Pre-commit regex QA checks
Regex testing tools rank best when they make pattern feedback immediate and easy to interpret. This page is optimized for that practical debugging flow.
It helps engineers catch edge cases early, including greedy matches, anchor misuse, and unexpected capture behavior.
Test both valid and invalid inputs to confirm your pattern avoids false positives.
g=global, i=ignoreCase, m=multiline, s=dotAll, u=unicode, y=sticky