I'm not sure I know what problem you're running into, but if you use Perl regular expression be sure to use (pregexp ...) to compile them or #px"..." to write them. Otherwise you get a slightly different regular expression language (compatible with Unix utilities like egrep, rather than with Perl). If you're using those regular expressions, they don't have backreferences.
Carl Eastlund On Fri, Oct 29, 2010 at 5:29 PM, Justin Phillips <[email protected]> wrote: > I'm trying to write a small regex that would return any repeating pattern in > a string e.g. ("ababcdcdababcdcd" would return "ab" "cd" abab" "cdcd" > "ababcdcd") > I'm having trouble using the backreferencing. I see under section 3.7.2 of > the guide (and also some Perl docs I've checked out) that I should be able > to write a simple regex "(1)\1" which would return true for the data "113" > but Racket says I'm wrong. Any help would be greatly appreciated. > -Justin _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
