Regex Tester evaluates regular expressions against test text in real time. Matches are highlighted with alternating colors, capture groups and named groups are broken out per match, and all standard flags (g, i, m, s, u, y) are supported. A replace mode shows how substitutions transform the text.
Regular expressions are the universal text-pattern language, but getting them right takes iteration. Regex Tester makes that iteration instant. Type a pattern and see matches highlight in the test text as you type. Each match card shows the matched substring, its index, and every capture group ($1, $2, ...) and named group ((?<name>...)) individually — no more guessing whether your groups captured what you expected. All six JavaScript regex flags are supported via both a compact flag input (gi, gim) and a friendlier checkbox row. The replace mode runs String.replace with your pattern and replacement string — supports $& (whole match), $1..$9 (groups), and named backrefs. Everything runs locally so input stays on your machine.
Matches highlight alternating purple and green colors as you type — see exactly what the regex captures without running the script.
Each match shows its index in the source, matched substring, and every capture group ($1, $2, ...) and named group with value.
Supports g (global), i (ignore case), m (multiline), s (dotAll), u (unicode), y (sticky). Toggle via compact input or checkbox row.
Enter a replacement string with $&, $1..$9, or $<name> backrefs. Click Replace to transform the test text instantly.
Output updates live on every keystroke. No Run button — tune your pattern until matches look right.
Invalid regex syntax is reported with the exact error message from the JavaScript engine so you can fix syntax fast.
Build a regex for emails, phone numbers, or ZIP codes, then test against edge cases before shipping to production code.
Extract structured fields (timestamps, IDs, IPs) from log lines by iterating on a regex until every expected format matches.
Verify a find/replace regex works safely on real code or text before running it over hundreds of files.
Experiment with features like lookahead, lookbehind, non-capturing groups, or Unicode property escapes in a safe, visual sandbox.
Paste the regex from your code, the input that should have matched, and see exactly where the regex fails — no more guessing.
Click the Regex icon in the DevSuite Pro dock. A panel opens with pattern, flags, test text, and replacement fields.
Type your regex between the slashes. Flags can be typed directly (gi) or toggled with checkboxes below.
Paste the text to search in the Test Text area. Matches highlight instantly.
The Match Details list below shows every match's index and captured groups. Confirm your groups capture what you expect.
Enter a replacement string with $1, $&, or $<name> backrefs. Click Replace to transform the text in place.
Instal·la DevSuite Pro gratuïtament i desbloqueja més de 39 eines de desenvolupador per al teu navegador.
