# Regex Tester

> Test a JavaScript regular expression against sample text in the browser, with live matches and g/i/m flags.

HTML version: https://fluentbi.com/tools/regex-tester

## How to use it

1. **Enter a pattern.** Type a regular expression and choose flags (global, case-insensitive, multiline).
2. **Add test text.** Paste the string you want to match against.
3. **Review matches.** Matches update as you type. Copy any match you need.

This tool runs entirely in the browser. Fluent BI does not receive the file or text you paste.