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Regex for ISO Date (YYYY-MM-DD)

Matches dates in YYYY-MM-DD format (basic validation).

The Pattern

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

javascript

const regex = /^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$/;
regex.test('2023-12-25');

python

import re
regex = re.compile(r'^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$')
bool(regex.match('2023-12-25'))

import "regexp"
matched, _ := regexp.MatchString(`^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$`, "2023-12-25")

rust

use regex::Regex;
let re = Regex::new(r"^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$").unwrap();
re.is_match("2023-12-25")