Regex for Dates: ISO 8601, MM/DD/YYYY, European
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. --- ISO 8601: YYYY-MM-DD ISO 8601 is the unambiguous international standard. It's the format used in APIs, databases, logs, and most programming contexts. If you have any choice in the matter, standardize on this. Breaking it down: — 4-digit year (0000–9999) — month: 01–09 or 10–12 — day: 01–09, 10–29, or 30–31 This matches: , , This rejects: (month…
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