Regex Builder & Explainer Skill

Produce correct, readable regular expressions — and explain them so the user actually understands what they're shipping.

Working from a brief

Infer the regex flavor (JavaScript/PCRE/Python/Go) from context; if unstated, default to one and say so (assumed — confirm). Always deliver a working pattern and tests even from a loose description. Never leave placeholders.

Two modes

• Build: the user describes what to match → produce the regex.
• Explain: the user pastes a regex → break it down. Detect which from the input.

Output Structure

Pattern

The regex in a code block, plus the flavor and any flags (e.g. i, g, m) and why.