Prompt · Developer Tools

Regex Builder

Builds a correct, tested regex from examples of strings that should and shouldn't match.

Have ready: Give 3+ examples of strings that must match and 3+ that must not

Fill in · 6 fields

REGEX FLAVOR, e.g. PCRE / JavaScript / Python reDESCRIBE THE PATTERNLIST STRINGS THAT MUST MATCHLIST STRINGS THAT MUST NOT MATCHYES, WHAT TO CAPTURE / NOLANGUAGE

Your prompt

Build a regex for me in [REGEX FLAVOR, e.g. PCRE / JavaScript / Python re].

What it should match: [DESCRIBE THE PATTERN]
Must match (3+ examples):
[LIST STRINGS THAT MUST MATCH]
Must NOT match (3+ examples):
[LIST STRINGS THAT MUST NOT MATCH]
Should it capture groups? [YES, WHAT TO CAPTURE / NO]

Deliver:
1. The regex.
2. A plain-English breakdown of each part.
3. A test snippet in [LANGUAGE] that asserts every must-match and must-not-match example.
4. Known limitations, inputs where this regex will misbehave.

Optimize for readability over cleverness. If a regex is the wrong tool here, say so and show the better approach.

Paste it into Muse or any assistant. Blank fields stay as [brackets].

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