Digital Solutions Tools

Developer Tools / Match viewer · Replace matches

Regex Tester

Inspect real matches, captures and replacements in a bounded worker.

Your input is processed in this browser tab. It is not sent to our server or saved by this app.

01 Your input

Limit: 200,000 UTF-8 bytes; operation-specific limits apply.

Upload a text file
Advanced options

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02 Your result

BROWSER ONLY

Your result will appear here.

Ready when you are.

Add your input and run the tool.
Your result will appear here.

How to use it

  1. Enter your input, or load an example to try the tool.
  2. Press the primary action. Ctrl+Enter also runs the tool.
  3. Copy or download the result.

Good to know

JavaScript regex syntax. Pathological expressions are stopped by the worker deadline.

Need something else? Explore the toolbox →

Text & Writing

Text Counter & Cleaner

Count words and characters, clean whitespace, sort lines and change case.

Input Text or UTF-8 file
Output Copy or download the actual result

Text statisticsRemove duplicate linesSort lines
Runs in your browserOpen tool
Text & Writing

Text Diff

Compare two documents with a line-by-line unified diff.

Input Text or UTF-8 file
Output Copy or download the actual result

Unified diff
Runs in your browserOpen tool
Text & Writing

List Compare

Find common lines, differences, symmetric differences and a combined unique list.

Input Text or UTF-8 file
Output Copy or download the actual result

Common linesOnly in first listOnly in either list
Runs in your browserOpen tool