Live matches as you type
Edit the pattern and your sample text updates instantly, so you can see exactly what does and does not match without a compile cycle.
Test regular expressions with matches and capture groups.
Regex Tester is the fast feedback loop your regular expressions deserve - type a pattern, see every match and capture group light up in your sample text live, and preview a replacement before you trust it in code.
Start the 14-day trial in the app. No payment method is required to try Foldout.
Processes on your MacTool work stays inside the local app.
Signed and notarizedBuilt for Apple Silicon Macs.
No usage trackingFoldout does not track what you do in the app.
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What it does
See exactly what your pattern matches, as you type.
Watch matches highlight as you type.
Inspect every capture group at a glance.
Preview replacements before you commit.
Stop debugging patterns in production.
Detailed capabilities
What Regex Tester covers.
Concrete features, inputs, and workflow details for this tool.
Groups laid bare
Each capture group is broken out clearly, so a gnarly pattern stops being a guessing game.
Try the replacement first
Preview a find-and-replace against the sample so you know the result before it touches real data.
How to use it
From opening the tool to saving the result.
- 01
Paste sample text.
- 02
Enter a regular expression.
- 03
Review matches and captures.
- 04
Try replacement output if needed.
Questions
Before you try Regex Tester
Which regex flavor does it use?
It uses the macOS regular expression behavior shown in the app.
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