Regex for Dates: Match ISO 8601, MM/DD/YYYY and European Formats
Match date strings with regex. Patterns for ISO 8601, US MM/DD/YYYY, European DD/MM/YYYY, and partial dates with optional year or day components.
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Tags: developer-tools, regex, dates
Regex for Dates: Match ISO 8601, MM/DD/YYYY and European Formats Date validation with regex is tricky because there are two separate problems: matching the format and validating the actual date value. Regex handles format well. It cannot tell you that February 30th doesn't exist. This article covers working patterns for every major date format, explains their limitations, and shows how to combine regex with a Date parse to get real validation. US Format: MM/DD/YYYY Matches: , , Rejects: , , (zero-padding required) US Format With Optional Zero-Padding If you need to accept both and : The makes the leading zero optional for both month and day. US Format With Multiple Separators To accept , , or as separators: Note: this does not enforce consistent separators — it would accept . If you need…
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