Regex Replace Tester Guide
Preview regex find-and-replace results with capture group references and live highlighting.
A short companion for Regex Replace Tester: when it is useful, what it expects, and what to check before using the result.
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 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.
Related guide
For broader background, see Testing Regex Before Shipping It.