Regex Builder

Casos de uso

• Building validation patterns for emails, URLs, phone numbers
• Parsing structured text formats (logs, CSV, config files)
• Search and replace operations with capture groups
• Explaining existing complex regex patterns
• Converting between regex flavors

Build a regex pattern for the following requirement:

"[describe what you want to match]"

Please provide:
1. The regex pattern
2. Step-by-step explanation of each part
3. Test cases (strings that should match and shouldn't)
4. Any edge cases or limitations
5. Performance notes if the pattern could be slow on large inputs

Target flavor: [JavaScript / Python / PCRE / Go]

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