Contact support@velnoxlabs.com or test.user@domain.co for assistance.
About RegEx Tester
Interactive Regular Expression (RegEx) debugger and pattern evaluator utilizing the ECMAScript RegExp engine with real-time match grouping, capture indexes, and flag controls.
Key features
Full support for ECMAScript flags: global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u), and sticky (y).
Real-time match highlighting, full capture group extraction, and index boundary inspection.
Instant pattern syntax error diagnostics and ReDoS avoidance execution.
Client-side pattern testing ensuring confidential strings and test corpora remain private.
How to use
Enter Regular Expression: Type your regex pattern and select desired expression flags (g, i, m, s, u).
Provide Test Corpus: Paste or type the target text string to evaluate against the compiled regex.
Inspect Matches and Groups: View highlighted match segments, captured group indices, and match counts.
FAQ
Which regex syntax and dialect does this tester evaluate?
It evaluates standard ECMAScript (JavaScript) regular expressions with full native engine performance.
What do the regex flags g, i, m, s, and u control?
Flag 'g' finds all matches, 'i' ignores letter casing, 'm' treats anchors ^ and $ per line, 's' lets . match newlines, and 'u' enables full Unicode code point handling.
Can I inspect numbered capture groups?
Yes, all numbered capturing groups and full matched substrings are parsed and displayed with their character index offsets.
Is it safe to test sensitive proprietary logs or passwords?
Absolutely. No test strings or regex patterns are transmitted over the network.
Got Feedback or Feature Requests?
Help us enhance VelnoxLabs developer utility standards. Share your feedback below!