php - Regex trouble with capturing repeated pattern
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Lets say I have the following string:
Some crap string here...(TRACK "title1" F (S #h88 (P #m6) (P #m31)) (S #k3 (P #m58) (P #m58)))(TRACK "title2" P (S #a54 (P #r8)) (S #v59 (P #a25) (P #y82)))...Some other crap string here
Out of this string I need to extract to following data:
- title1
- F
- (S #h88 (P #m6) (P #m31)) and (S #k3 (P #m58) (P #m58))
and
- title2
- P
- (S #a54 (P #r8)) and (S #v59 (P #a25) (P #y82))
where
- is some kind of title.
- is some kind of status.
- is some kind of list of lists, like
(S #xx (P #xx)).
Having limited regex knowledge, I can get 1 and 2, but only get the first part of 3.(S #xx (P #xx)) can exist multiple times and also the inner (P #xx) can exist multiple times.
I've tried many regex expression and consulted a lot of posts, but I keep having troubles getting the data out as requested.
So now I'm back at\(TRACK "(.*?)" ([P|F]) (\(S.*?\)\)) which only captures the first of two lists in this example string.
see: https://regex101.com/r/FM0ZZR/1
What do I need to do to get all lists as described?
Answer
Solution:
You can use
\(TRACK\s+"([^"]*)"\s+([PF])((?:\s+(\([SP](?:[^()]*+|(?-1))*\)))*\))
See the regex demo.
Details
\(TRACK- a(TRACKsubstring\s+- one or more whitespaces"- a"char([^"]*)- Group 1: any zero or more chars other than""- a"char\s+- one or more whitespaces([PF])- Group 2:PorF((?:\s+(\([SP](?:[^()]*+|(?-1))*\)))*\))- Group 3:(?:\s+(\([SP](?:[^()]*+|(?-1))*\)))*- zero or more repetitions of\s+- one or more whitespaces(\([SP](?:[^()]*+|(?-1))*\))- Group 4 (technical, necessary for recursion):\(- a(char[SP]-SorP(?:[^()]*+|(?-1))*- zero or more chars other than(and)or the whole most recently captured pattern\)- a)char
\)- a)char.
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