php - Codeigniter Routing with PCRE -


i trying create routing rule in codeigniter installation uses pcre.

what trying match this

http://example.com/segment1/segment2/(capturethis)

so can use "capturethis" portion input method. want make match if "segment1" not "admin". there may number of segments. represent segment ([^/]*), other "/" while using "/" in between each ([^/]*).

at first thinking of writing expression did not match "admin" or "/" [^[\/|admin]\/]*([^\/]*) had no luck.

after looking around believe might achieved using negative lookbehind, i'm having trouble figuring out how this. trying ^(?<!/|i/admin/)[/([^/]*)]* leave me potentially unknown amount of captured segments , need last without knowing how many there are.

has done before or knows how this? i'm sure i'm on looking simple, not fluent in regex i'd be.

update:

thank update on how codeigniter handles routes..i think should on same page now. ^ character has special meanings in character classes , won't have affect expect in lookarounds..also, shouldn't necessary since using negative lookahead ((?!...)). however, said, (?!admin)([^/]*) still has issues since [^/]* match dmin because when @ character d not followed admin. solve this, want positive lookbehind assertion also. make sure either right after beginning of string or forward slash (d wouldn't match in case, since right after a):

(?!admin)(?<=^|/)([^/]*)

demo

you can't throw admin in character class think, since a, d, m, i, or n. however, close negative lookarounds. key remember these zero-width assertions , not match characters. in case want use negative lookahead. because begin match new segment following /, want make sure point on (ahead) admin not matched..if isn't matched, can continue capture ([^/]*) typically do.

i'm not versed in codeigniter, may not need use in routing..but should show how works:

/(?!admin)([^/]*)

demo


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