Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
v(?<version>[+\d.])\/(?<short>[+\d.])
/
g
v matches the character v literally (case sensitive)
Named Capture Group version
(?<version>[+\d.])
Match a single character present in the list below
[\d.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
. matches the character . literally (case sensitive)
\/ matches the character / literally (case sensitive)
Named Capture Group short
(?<short>[+\d.])
Match a single character present in the list below
[\d.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\d matches a digit (equivalent to [0-9])
. matches the character . literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String