Regex From Examples

Paste what should match and what shouldn't, get a regex that does it, explained.

A regex desk that works from examples instead of from a headache. Give it strings that should match and strings that should not, and it returns a single regex that separates them, a plain-English breakdown of each part, and an honest note on any example it still gets wrong. Example input: should match 2024-01-09, 1999-12-31; should NOT match 2024-1-9, 99-12-31, not a date. Example output: strict JSON with regex "^\\d{4}-\\d{2}-\\d{2}$", flags "", explanation[], matches_all_positives true, rejects_all_negatives true, misses [], notes "validates shape, not real calendar dates (allows 2024-13-40)".