Regex Tester
Test regular expressions against text with real-time match highlighting. All processing happens client-side -- your data never leaves your browser.
//g
Flags:
Matches will be highlighted here...
How to Use the Regex Tester
- Enter your regular expression pattern in the pattern input field.
- Select the flags you need: global (g), case-insensitive (i), multiline (m), or dotAll (s).
- Type or paste your test string into the text area below.
- Matches are highlighted in real-time with full details including capture groups.
Supported Flags
- g (global) -- Find all matches rather than stopping after the first
- i (case-insensitive) -- Match letters regardless of case
- m (multiline) -- ^ and $ match the start/end of each line
- s (dotAll) -- Dot (.) also matches newline characters
Features
- Real-time match highlighting as you type
- Capture group extraction with index positions
- Named capture group support
- Graceful error handling for invalid patterns
- 100% client-side processing for full privacy
- No data stored, no sign-up required