Regex Tester
Test regular expressions with real-time matching, highlighting, and group extraction.
Flags:
What is Regex Tester?
Regex Tester is a free online tool for testing regular expressions with real-time match highlighting. No installation required.
How to test regular expressions?
- Enter your regular expression in the pattern field
- Paste your test text in the input area
- Select flags: g (global), m (multiline), i (case-insensitive)
- Matches are highlighted in real-time as you type
Regex flags explained
The g (global) flag finds all matches. The m (multiline) flag makes ^ and $ match line starts/ends. The i (case-insensitive) flag ignores letter case.