# Regex Replace Tester Guide

Preview regex find-and-replace results with capture group references and live highlighting.

- Tool: https://ilham.dev/tools/regex-replace-tester/
- Guide URL: https://ilham.dev/guides/regex-replace-tester/
- Tool guides index: https://ilham.dev/guides/tools/
- Broader guide: Testing Regex Before Shipping It (https://ilham.dev/guides/regex-testing/)

## What it does

Test a find-and-replace before running it. Enter a pattern, flags, a replacement string (with $1 group references) and sample text; the preview highlights matches and the result box shows the output.

## Use the tool

Open https://ilham.dev/tools/regex-replace-tester/, add the input the tool asks for, run it, and check the output before using it elsewhere.

## Input and output

- Input: text.
- Output: text.
- Category: Workflow.

## Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.

## Questions

### Why do I get no replacements with a non-global flag?

Without the g flag only the first match is replaced, exactly like String.replace in JavaScript.