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Test regex patterns for date validation. Match ISO 8601, DD/MM/YYYY, MM-DD-YYYY, and custom date formats.
> Test patterns against real text and inspect all matches.
> Toggle flags, debug errors, and copy the final expression.
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ISO 8601 (YYYY-MM-DD): /^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/. For European format (DD/MM/YYYY): /^(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[0-2])\/\d{4}$/. Note that regex cannot validate logical constraints like leap years — combine with a Date parser for complete correctness.
No. Regex checks format only. Use your language's native Date parser to validate actual calendar values.
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