Interactive Regex Studio & Testing Sandbox
A general-purpose regex workbench: edit the pattern, toggle flags, and watch matches highlight in real time as you type. The default pattern hunts for error, warning, and failure keywords in log output.
runs 100% in your browser — nothing is uploaded
- 1Paste your textDrop your logs, code, or data into the test box on the right.
- 2Tweak the patternEdit the regex formula or toggle the g / i / m flags on the left.
- 3See matches instantlyMatching text lights up as you type, with a live counter.
//gi
Explanation — token breakdown▾
Matches: 0
Matching runs locally as you type — nothing you paste here leaves this tab.
Expected output — what the pre-loaded example matches
Matches found: 5 WARN → line 2 (case-insensitive: i flag) ERROR → line 3 error → line 5 failed → line 5 warning → line 6 No match: "terrorism-free" and "errorless" — the \b word boundary only matches whole words, not substrings inside longer words.
This is the result the sandbox above computes from its sample data — edit the pattern, flags, or test string and the live match counter recalculates instantly.