Regular Expressions 101

Community Patterns

Community Library Entry

0

Regular Expression
PCRE (PHP <7.3)

/
^ # Start of version string \s* # Ignore leading whitespace (?:v\.?)? # Optional "v" or "v." before the version (?<major>\d+) \. (?<minor>\d+) \. (?<patch>\d+) # MAJOR.MINOR.PATCH (?:- # Pre-release versions start with '-' (?<pre> # Capture the pre-release identifier(s) (?: # The PR rules are annoyingly tight [0-9A-Za-z-] # No leading `0`, but a `0` on its own is fine | # More than one character... [1-9A-Za-z-][0-9A-Za-z-]* # ...means no leading zero ) # That's the FIRST pre-release identifier (?: # Multiple are allowed... \. # ...dot-separated... (?: # ...with the same rules as above [0-9A-Za-z-] | [1-9A-Za-z-][0-9A-Za-z-]* ) )* # Of course, you can also have just the one ) # End name-cap group `pre` )? # End non-cap group encompassing the leading `-` and the identifiers (?: # Built metadata is SIMILAR, but with two differences: \+ # Difference one: starts with `+` (?<meta> [0-9A-Za-z-]+ # Difference two: leading `0` is allowed, so the match rule is simpler (?:\.[0-9A-Za-z-]+)* # Same dot-delim repetition ) # End name-cap group `meta` )? # End non-cap group encompassing leading `+` and identifiers \s* # Ignore trailing whitespace $ # End version string
/
gmix

Description

Implements PCRE named-capture (with comments) for the Semantic Versioning 2.0.0 standard - processing is left an exercise for the reader ;)

Submitted by anonymous - 6 years ago