On 03/21/2011 10:07 AM, Terry Carmen wrote: > I'm trying to match any URL that points to a URL shortener. > > They typically consist of http(s) followed by a domain name, > a slash and a small series of alphanumeric characters, > *without a trailing "/" or file extension*. > > I seem to be having pretty good luck matching the URL, however I > can't figure out how to make the regex explicity *not* match > anything that ends in a slash or contains an extension. > > For example, I want to match "http://asdf.ghi/j2kj4l23";, but not > "http://asdf.ghi/j2kj4l23/abc.html"; or "http://asdf.ghi/j2kj4l23/";
In this specific case, I think you want a simple end-of-line indicator, uri ASDF_GHI_SHORT m'^http://asdf\.ghi/[\w-]{1,12}$'i In order to match http://asdf.ghi/j2kj4l23#mno you might want: uri ASDF_GHI_SHORT m'^http://asdf\.ghi/[\w-]{1,12}(?:[^/.\w-]|$)'i ( I used m'' instead of // so I didn't have to escape the slashes. Any punctuation can be used in that manner, though the leading "m" is only optional in m// ). > I tried using the perl negative look-ahead as both : (?!/) and > (?!\/) without success. As to using a negative look-ahead operator: Though I'm not exactly sure about when it's needed, you sometimes have to put something after it, like /foo(?!bar)(?:.|$)/ ... this is not mentioned in the spec.
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