About This Tool
The Regex Tester helps you try JavaScript regular expressions against sample text. It supports the common g, i, and m flags, highlights matches in the test text, and lists matched values so you can quickly see whether a pattern behaves the way you expect.
ToolPool runs this utility in your browser, so your input stays on your device and is not uploaded to our server.
How To Use This Tool
- 1Enter a JavaScript regular expression pattern without wrapping slashes.
- 2Toggle global, ignore-case, or multi-line flags as needed.
- 3Paste test text and review highlighted matches, match count, and matched values.
Benefits
Common Use Cases
- Testing a validation pattern before adding it to a form.
- Checking log extraction patterns against real sample lines.
- Debugging case sensitivity or multi-line anchors.
- Counting repeated matches before using a find-and-replace workflow.
Workflow Tips
Regex Tester is designed for quick browser work, but it is still worth reviewing the result before you use it in a live project, client document, public page, or production workflow. Keep an original copy of important source material, compare the output with what you expected, and repeat the task with slightly different settings when quality, formatting, or accuracy matters.
For larger workflows, pair this page with Text Compare, Remove Duplicate Lines, Word Counter, JSON Validator. Moving between related utilities can save time when you need to clean source data, prepare web assets, create supporting IDs, check calculations, or package output for another system. Internal links also make it easier to stay in one private workspace instead of jumping between several single-purpose sites.
The local processing model helps protect sensitive content because ToolPool does not need to receive your files, text, or form values to complete the task. Good privacy habits still matter after the result leaves the page: avoid pasting unnecessary secrets, check downloaded files before sharing them, and clear the workspace when you are finished on a shared computer.