Regex Named Group Extractor

How to use this developer tool

1. Paste the records to parse.
2. Enter a pattern containing one or more (?<name>...) groups.
3. Choose flags; global matching is added for extraction.
4. Run the tool and review the JSON records and unmatched counts.

What this developer tool does

The JSON output contains one object per match, with properties taken directly from named capture groups.

Duplicate group names and their availability depend on the JavaScript engine and pattern structure.

Example

Pattern: (?<key>\w+)=(?<value>\w+)
Input: mode=dark
Output: {"key":"mode","value":"dark"}

Use cases

• Parse structured log lines.
• Extract fields from filenames.
• Prototype text-to-JSON migrations.

Tips for reliable output

• Use descriptive group names.
• Anchor line records with ^ and $ plus m.
• Make delimiters explicit.
• Review null values from optional branches.

Processing details

The global iterator collects named groups only. Every record also carries the zero-based match index in the JSON metadata returned by the page.

Patterns without named groups are rejected. A 10,000-match cap prevents runaway result generation.