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Regex Tester

Debug JavaScript-style regular expressions with live matches and capture groups—paste sample text and tune patterns interactively.

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Editor

Adjust the asset, then export it.

Upload, paste, or preview the source, tune the options, and leave with a copy-ready or downloadable result.

Source

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Preview

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Export

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Editor workspace and output options

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Use the result area as the copy-ready handoff for the next step in your work.

Input
The text, data, code, or settings you provide.
Result
Cleaned, generated, validated, converted, or formatted output.
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Sample inputs and editing tips

How to edit and export cleanly

The Regex Tester gives immediate feedback while you tune a JavaScript-style regular expression against real sample text.

It is best for finding capture groups, checking flags, and confirming a pattern before it moves into code.

Common use cases

  • Test extraction patterns for emails, IDs, URLs, SKUs, dates, and log lines.
  • Debug capture groups before writing a replace operation.
  • Create examples for documentation or code review.

How to use it well

  1. Paste the source data or upload a supported file when the tool allows it.
  2. Select formatting, conversion, or generation options.
  3. Run the tool and check errors or warnings before using the result.
  4. Copy the output into your editor, terminal, documentation, or test file.

Practical tips

  • Test both matching and non-matching examples to avoid overly broad patterns.
  • Use anchors when the whole line or whole string must match.
  • Escape user-provided text before turning it into a regex pattern.

Limitations to know

  • The tester follows browser JavaScript RegExp behavior, not every server-side regex dialect.
  • Complex patterns can become slow on very large text.

FAQ

Q: Which regex flavor is used?

A: JavaScript (ECMAScript) regex syntax.

Q: What flags are supported?

A: g (global), i (case-insensitive), m (multiline), s (dotAll).

Q: Does it show capture groups?

A: Yes, all capture groups are listed for each match.

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Privacy: This tool runs entirely in your browser. No data is sent to our servers. We don't store, share, or have access to any of the information you process here.