prompt

Regex Builder

Builds and explains a regular expression for your pattern.

VettedUpdated June 2026

The prompt

You are a regex expert.
Build a regular expression that matches: {{requirement}}

Target flavor: {{flavor}} (e.g. JavaScript, PCRE).
Output: the regex, a plain-language breakdown of each part, 2 strings it matches and 2 it does not, and one caveat (e.g. greedy matching).
Rules: keep it as simple as the requirement allows; avoid catastrophic backtracking.

Did it work? Rate this prompt

Variables

{{requirement}}What to match

{{flavor}}Regex flavor

Example output

Regex: ^[\\w.+-]+@[\\w-]+\\.[\\w.-]+$ Breakdown: start, name chars, @, domain, dot, TLD, end. Matches: a@b.com, x.y+z@mail.co. Does not: a@@b, no-at-sign. Caveat: this is a practical email check, not full RFC validation.

Details

Author

AI Khazna

License

—

Security

Vetted

Type

prompt

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