Racket regular-expression matching
- by Inaimathi
I'm trying to create a regex that matches the inverse of a certain string type (so, strings not ending in ".js", for example).
According to the documentation, that should be the expression #rx"(?!\\.js$)", but it doesn't seem to work. To test it out, I have this function:
(define (match-test regex)
(map (lambda (text)
(regexp-match? regex text))
'("foo.js" "bar.css" "baz.html" "mumble.gif" "foobar")))
(match-test #rx"\\.js$") returns (#t #f #f #f #f) as expected, but (match-test #rx"(?!\\.js$)") returns (#t #t #t #t #t), where I would expect (#f #t #t #t #t).
What am I doing wrong, and how do I actually get a regex in Racket to express the idea "match anything which does not contain [x]"?
