Regex Online Tester

• Free online regular expression testing tool with real-time matching, syntax highlighting, group capture, and common regex patterns
• Enter a pattern and test text to instantly see all matches, positions, and capture-group details

1. Open the tool page — no installation needed
2. Type a regular expression in the Regular Expression box and paste your text in Test Text; toggle the flags (g/i/m/s/u/y) as needed, or click Load Example to fill both
3. Matches are highlighted and listed in real time as you type; switch to the Replace tab and click Replace to substitute text, then use the copy buttons to copy the pattern, a match, or the result

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online regular expression testing tool with real-time matching, syntax highlighting, group capture, and common regex patterns. Test and debug your regular expressions instantly.

Open the tool page — no installation needed Type a regular expression in the Regular Expression box and paste your text in Test Text; toggle the flags (g/i/m/s/u/y) as needed, or click Load Example to fill both Matches are highlighted and listed in real time as you type; switch to the Replace tab and click Replace to substitute text, then use the copy buttons to copy the pattern, a match, or the result

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Regex Online Tester is completely free. No download or installation required — it runs right in your browser.