php - Regex - matching all between second set of brackets ([]) -


i have following string need match last 7 digets between [] brackets. string looks

[15211z: 2012-09-12] ([5202900])

i need match 5202900 in string contained between ([]), similar number appear anywhere in string won't work (\d{7})

i tried following regex

([[0-9]{1,7}])

but includes [] in string?

if want 7 digits, not brackets, want make sure digits surrounded brackets:

(?<=\[)\d{7}(?=\])

fyi: called positive lookahead , positive lookbehind.

good source on topic: http://www.regular-expressions.info/lookaround.html


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