Regex Match Extractor

How to use this developer tool

1. Enter the source text.
2. Provide a JavaScript pattern without slash delimiters and choose flags.
3. Extract matches and review positions plus numbered captures.
4. Export rows when the results need further analysis.

What this developer tool does

Each line lists the full match, its zero-based index, and any captured substrings.

Regular expressions are code-like input; avoid testing unknown complex patterns against large text.

Example

Pattern: #[0-9a-f]{6}
Text: Colors #aabbcc and #112233
Matches: two hex values

Use cases

• Extract IDs from logs.
• Prototype scraping expressions.
• Audit capture group contents before coding.

Tips for reliable output

• Do not include / delimiters.
• Use the u flag for Unicode-aware patterns.
• Anchor patterns when boundaries matter.
• Start with small input for unfamiliar patterns.

Processing details

If g is absent it is added for extraction while other supplied flags are preserved. Indices refer to UTF-16 code-unit offsets used by JavaScript.

The browser engine determines supported syntax. Lookbehind and newer flags may not exist in older browsers.