Regex Tester

Format / Validate

Test, validate, and debug JavaScript regular expressions.

No matches found.

0 chars

Paste text on the left to see the cleanup in action.

Pattern\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b
Flagsgi
Input Length0
Valid
Match Count0
1

Input

Paste your messy text or data into the source field.

2

Options

Adjust tool settings to customize the transformation.

3

Result

Copy or download your clean results instantly.

How to use this tool

1

Paste your sample text into the input field.

2

Enter your JavaScript Regular Expression in the "Regex Pattern" field.

3

Select the mode (e.g., Test matches, Replace matches).

4

Review the match report or transformed output in the results pane.

5

Copy the refined text or inspection results.

Common uses

  • Validating a regex pattern before using it in code
  • Extracting specific data like email addresses, IDs, or dates
  • Debugging complex capture groups and named groups
  • Testing bulk find-and-replace logic with back-references
  • Splitting logs or messy data into clean lists by a regular pattern

Privacy is built-in

Standard tools at BetterPaste perform all processing locally in your web browser. Your data is never intentionally sent to our servers for processing.

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