ISO 8601 Date in PY
Match dates in ISO 8601 format: YYYY-MM-DD with valid month (01–12) and day (01–31) ranges.
Try it in the PY tester →Pattern
regexPY
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01]) (flags: g)Python (re) code
pyPython
import re
pattern = re.compile(r"\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])")
input_text = "2024-01-15"
for m in pattern.finditer(input_text):
print(m.group(0))Stdlib `re` module — no third-party dependency. Works on Python 3.6+.
How the pattern works
Year is any 4-digit number. Month uses alternation to enforce 01-12. Day enforces 01-31, though it won't catch month-specific overflows (e.g. Feb 30).
Examples
Input
2024-01-15Matches
2024-01-15
Input
1999-12-31Matches
1999-12-31
Input
2024-13-01No match
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