hi All,
I have a regex /(.+)_id$/ in a rails application that matches any string that ends with _id . I need it to match any string that ends with _id except associated_id. How can I accomplish this?
thx :)
-C
views:
143answers:
2
+7
A:
/(.+)(?<!associated)_id$/
will use negative lookbehind to make sure that whatever was matched by (.+) doesn't end in associated.
For languages that don't support lookbehind, you can use this:
/\A(?!.*associated_id$)(.+)_id$/
This will assert that it's not possible to match a string ending in associated_id from the starting position of the string.
Tim Pietzcker
2009-11-23 20:05:55
I'm trying to do this in rails, if i plug in "associated_id".match(/(.+)(?<!associated)_id$/) i get SyntaxError: compile error(irb):4: undefined (?...) sequence: /(.+)(?<!associated)_id$/ from (irb):4
Chris Drappier
2009-11-23 20:10:57
Oh. Ruby does not support lookbehind, I just found out. Will edit.
Tim Pietzcker
2009-11-23 20:23:17
thank you Tim :)
Chris Drappier
2009-11-23 20:27:37
A:
I'm not a "regexpert" so i'm sure there's probably a better way of doing this, but i came up with
/(.+[^associated_id].+)_id$/
Jim McKerchar
2009-11-24 17:15:35