RegexdrillSemantic versions
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 semantic version: three numbers separated by periods, each either 0 or a number with no leading zero, optionally followed by a hyphen and a pre-release label made of letters, digits, periods or hyphens, like 1.0.0-beta.2.
What this exercise teaches
(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)(?:-[0-9A-Za-z.-]+)? refuses leading zeros like 1.02.0, which \d+ would accept, and keeps the hyphen attached to the label so 1.0.0- fails.
A hint if you get stuck
Write one number as 0|[1-9]\d* inside a non-capturing group and use it three times. Put the pre-release part in an optional group that starts with the hyphen.
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