What regex flavour does the tester use?

FixTools Regex Tester uses JavaScript regex (ECMAScript). This is the native regex engine of the browser and covers the vast majority of regex use cases.

How do I test a regex pattern for global matching?

Enable the g (global) flag to find all matches in your test string rather than just the first one.

Can I test named capture groups?

Yes. Named capture groups using the (? ...) syntax are supported and shown in the match results panel.

Does the tool explain what my regex does?

The tool highlights matches and shows capture groups. For step-by-step explanations of complex patterns, see the Regex Cheatsheet page for common pattern breakdowns.

Is FixTools Regex Tester free?

Yes — completely free with no sign-up, no usage limits, and no subscriptions.

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Regex Tester Online — Free Live Pattern Testing

Test regular expressions against real text instantly with FixTools Regex Tester. Write a pattern, enter your test string, and see matches, captured groups, and positions highlighted in real time — no page reloads, no account required.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Live matching as you type your pattern

🔒

Shows match groups and capture positions

✨

Supports common regex flags (g, i, m, s)

Developer Tool

Regex Tester

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How to use this tool

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Enter your regex pattern and test string. Matches are highlighted instantly as you type, with capture groups shown in the results panel.

How It Works

Step-by-step guide to regex tester online — free live pattern testing:

1
Open Regex Tester
Click "Open Regex Tester" to launch the tool.
2
Enter your regex pattern
Type or paste your regular expression into the pattern field. No delimiters needed — just enter the pattern itself.
3
Select flags
Set any flags you need: g for global matching, i for case-insensitive, m for multiline, or s for dotAll mode.
4
Enter test string
Type or paste the text you want to test your pattern against.
5
Review matches
Matches are highlighted in the test string in real time. The results panel shows each match, its position, and any named or numbered capture groups.