Re: [SOLVED] need some regex help to strip out // comments but not http:// urls

On Wed, May 29, 2013 at 4:26 PM, Daevid Vincent <daevid@daevid.com> wrote: > > >> -----Original Message----- >> From: Sean Greenslade [mailto:zootboysean@gmail.com] >> Sent: Wednesday, May 29, 2013 10:28 AM >> >> Also, (I haven't tested it, but) I don't think that example you gave >> would work. Without any sort of quoting around the >> "http://" >> , I would assume the JS interpreter would take that double slash as a >> comment starter. Do tell me if I'm wrong, though. > > You're wrong Sean. :-p Glad to hear it. I knew I shouldn't have opened my mouth. =P (In all seriousness, I realize that I mis-read that code earlier. I think I was still reeling from the suggestion of doing arbitrary string replacements in files.) > > This regex works in all cases listed in my example target string. > > \s*(?<!:)//.*?$ > > Or in my actual compress() method: > > $sBlob = preg_replace("@\s*(?<!:)//.*?$@m",'',$sBlob); > > Target test case with intentional traps: > > // another comment here > <iframe src="http://foo.com"> > function bookmarksite(title,url){ > if (window.sidebar) // firefox > window.sidebar.addPanel(title, url, ""); > else if(window.opera && window.print){ // opera > var elem = document.createElement('a'); > elem.setAttribute('href',url); > elem.setAttribute('title',title); > elem.setAttribute('rel','sidebar'); > elem.click(); > } > else if(document.all)// ie > window.external.AddFavorite(url, title); > } > And if that's the only case you're concerned about, I suppose that regex will do just fine. Just always keep an eye out for double slashes elsewhere. My concern would be something within a quoted string. If that happens, no regex will save you. As I mentioned before, regexes aren't smart enough to understand whether they're inside or outside matching quotes. Thus, a line like this may get eaten by your regex: document.getElementById("textField").innerHTML = "Lol slashes // are // fun"; The JS parser sees that the double slashes are inside a string, but your regex won't. Just something to be aware of, especially because it's something that might not show up right away. -- --Zootboy Sent from some sort of computing device.