RegexdrillDates YYYY-MM-DD
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
The whole line must match. Match a date written YYYY-MM-DD with a month from 01 to 12 and a day from 01 to 31. Do not worry about month lengths.
What this exercise teaches
\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01]) limits months to 01 to 12 and days to 01 to 31.
A hint if you get stuck
Spell out the valid ranges with alternation: a month is 0 then 1-9, or 1 then 0-2.
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