Regex Tester
Test regular expressions with live highlighting, groups and replace.
Runs in your browser: data never leaves your device. Free, no sign-up. Also known as: regexp, regular expression, pattern.
How to use Regex Tester
- Paste your input, open a file, or press Sample to see an example.
- Pick a mode or adjust the options; results update instantly.
- Use Copy or Download to take the result with you.
Frequently asked questions
- What does the Regex Tester do?
- Test regular expressions with live highlighting, groups and replace.
- Is the Regex Tester free?
- Yes. It is completely free, with no sign-up, no watermark and no usage limits.
- Is my data safe?
- Yes. This tool runs entirely in your web browser. Your text and files are never uploaded to a server, stored or logged.
- Does it work on mobile?
- Yes. It works in any modern browser on Windows, macOS, Linux, Android and iOS, with nothing to install.
- What other text & writing tools are there?
- Runeforge has 11 text & writing tools in Scribe's Desk, plus 94 more tools across other categories.
More from Scribe's Desk
- Word & Character Counter
Words, characters, sentences, paragraphs and reading time.
- Case Converter
UPPER, lower, Title, Sentence, camelCase, snake_case and more.
- Text Diff Checker
Compare two texts line-by-line, word-by-word or char-by-char.
- Remove Duplicate Lines
Remove repeated lines, optionally ignoring case.
- Sort Lines
Sort lines alphabetically, naturally, by length, reverse or shuffle.
- Whitespace Cleaner
Trim lines, collapse spaces and remove blank lines.