Why does my slash need escaping?

Special characters have regex meanings. Escape them when you want literal matches.

Can regex validate every format?

No. Regex is useful for patterns, but complex formats may need a parser.

Regex Tester

Test JavaScript regular expressions against sample text and inspect live matches.

Developer ToolsRuns in browserNo signup

How to use

Paste your input, click the primary action, and copy the result. Everything runs locally in your browser.

Example: \btool\w*\b ToolKit and ToolsFam are tool websites.

InputOutputread only

About Regex Tester

A regex tester helps you verify a pattern against real sample text before putting it into code, validation rules, scraping scripts, log filters, or search pipelines. Regular expressions are compact but easy to get wrong, especially around escaping, word boundaries, grouping, and greedy matches.

This tool treats the first line as the pattern and the remaining lines as sample text, then lists every match with its index. It is intentionally lightweight for quick JavaScript-style regex checks without opening a full IDE or writing a test harness.

Use it for form validation, route matching, text extraction, log inspection, and QA examples. Always test edge cases, empty strings, Unicode text, and inputs that should not match.

Regex Tester Knowledge Base

What It Is Used For

Test JavaScript regular expressions against sample text and inspect live matches. People usually use this tool when they need fast, repeatable output without opening a heavy desktop app or sharing private data with a third-party service.

How To Use It

Paste your input, adjust the visible options, run the action, then copy or download the result. For keyboard-heavy workflows, supported tools also respond to Ctrl+Enter or Cmd+Enter.

Search Topics Covered

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