Dev Tools
Regex Tester
Highlighted matches, captures list, flag support. No delay.
Esc Clear
Matches Match count:
Groups
Match
[$]
No matches
Enter a regex pattern and test string
What does Regex Tester?
A tool to test and debug regular expressions with live match highlighting.
How to use Regex Tester?
- Enter your regex pattern in the expression field.
- Paste the text you want to test.
- Matches are highlighted in real time with count and capture groups.
Key features
- Live match highlighting
- Flag support: g, i, m, s
- Displays match count and capture groups
Frequently asked questions
Which regex flavor is used?
JavaScript RegExp — compatible with most modern programming languages.
What do the flags mean?
g=all matches, i=case insensitive, m=multiline, s=dot matches newline.
Is this tool free?
Yes, this tool is completely free and requires no registration.
Is my data saved?
No. All calculations happen in your browser only — no data is sent to any server.