Highlight RegExp Matches in Text

Want to check if your regular expression matches a specific piece of text? The Test Text with a RegExp Tool lets you paste any text, enter a pattern, and instantly see whether or not it matches complete with a flash effect to confirm each update. It’s perfect for quickly testing patterns, learning regex, or debugging tricky matches.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
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Options

How to Use:

  1. Paste or type your content into the Input Text box.
  2. (Optional) Click Choose File to import a .txt, .csv, .log, or other plain-text file.
  3. In the Options box:
    • Enter your RegExp Pattern, such as \d{4} for four-digit numbers or \S+@\S+\.\S+ for emails.
    • Set any Flags you want (e.g., g for global, i for case-insensitive, m for multiline).
  4. The result appears immediately in the RegExp Test Result box. If your pattern matches any part of the input, you’ll see a ✅ Match found message; if not, it will show ❌ No match.
  5. Each update triggers a flash border animation, confirming the result has changed.
  6. Use Copy Output to copy the result or Export to File to save it as a .txt.
  7. Click Clear All to reset everything.

What Test Text with a RegExp Tool can do:

This tool tests your regular expression against the input and tells you instantly whether it matched. It doesn’t extract content or highlight matches – it’s focused purely on pass/fail validation. The result is easy to understand, updates live, and gives you quick feedback as you tweak your pattern or flags.

Example:

Input:

The user’s email is [email protected]

RegExp Pattern:

\S+@\S+\.\S+

Flags:

g

Output:

✅ Match found

Change the pattern to something that doesn’t match, and the result will switch to:

❌ No match

Common Use Cases:

Great for developers testing patterns, writers validating inputs, or anyone who needs fast regex feedback. It’s especially useful for practicing or debugging regular expressions before integrating them into scripts, validation logic, or data extraction workflows.

Useful Tools & Suggestions:

If you’re already working with regex, Test Text with a RegExp is a great way to fine-tune your patterns before running extractions. And once you’ve got the matches, Highlight RegExp Matches in Text lets you visually tag them perfect for reviews, debugging, or interactive previews.

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