Date (YYYY-MM-DD) Regex

An ISO 8601 calendar date: a four-digit year, a month from 01 to 12 and a day from 01 to 31.

/^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$/

Piece by piece

1. ^the start of the text
2. \d{4}a digit (0–9), repeated exactly 4 times, as many as possible
3. -the character “-”
4. (?:a group (not captured)
5. 0the character “0”
6. [1-9]one of 1–9
7. |or
8. 1the character “1”
9. [0-2]one of 0–2
10. )end of the group
11. -the character “-”
12. (?:a group (not captured)
13. 0the character “0”
14. [1-9]one of 1–9
15. |or
16. [12]one of “1”, “2”
17. \da digit (0–9)
18. |or
19. 3the character “3”
20. [01]one of “0”, “1”
21. )end of the group
22. $the end of the text

Examples

• It doesn't know month lengths or leap years: 2026-02-30 matches. Check the date itself after matching.

Other common patterns

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