Developersregexparsingvalidation

Regex Blueprint & Edge-Case Validator

Generates precise regular expressions based on target string matches and non-matches, with step-by-step breakdowns.

Use Case

Use this when building complex input validation schemas or string parser scripts without trial-and-error.

AI Prompt

Act as a senior software engineer specialized in parsing and regex design. Generate a robust, performant regular expression that matches the desired patterns and excludes the invalid cases specified below. Provide a detailed, step-by-step written explanation of every token used in the regex, and specify any required flags (e.g., global, case-insensitive, multiline). Desired Matches: [insert strings that must match] Invalid Non-Matches: [insert strings that must not match]

How to Use

1List examples of what the regex should and should not capture.
2Paste them into the prompt placeholders.
3Run the prompt and verify the breakdown before implementing.

Example Output

The resulting regular expression starts with an anchor followed by a non-capturing group that checks for valid ISO date formats. It enforces a four-digit year, followed by a hyphen, then a two-digit month from zero-one to twelve, followed by a two-digit day. The breakdown confirms it rejects bad dates like February thirty-first.

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