Java Regex: replacing a specific kind of url in a string?

Question

Sample input:

"http://bits.wikimedia.org/w/extensions-1.17/MobileFrontend/stylesheets/webkit.css"

my attempt: "http://.*?/stylesheets/webkit.css" does not find any matches

The part of the url between "http://" and "webkit.css" is variable

Thanks!

My bad, I was using Java's replace() function as opposed to replaceFirst() or replaceAll()

Are you escaping your periods appropriately? And how are you trying to replace a String or Strings here? Can you show more code? — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Aug 21, 2011 at 19:19
What code are you using? Your regex is really simple and should work. @Hovercraft Full Of Eels, even if he doesn't, it should match anyway (though it would indeed be better to escape them) — dee-see
– dee-see, Commented Aug 21, 2011 at 19:21

aioobe · Accepted Answer · 2011-08-21 19:27:53Z

3

One solution using groups:

String input = "http://bits.wikimedia.org/w/extensions-1.17/" + 
               "MobileFrontend/stylesheets/webkit.css";

String replacement = "example.com";

String result = input.replaceAll("(http://).*?(/stylesheets/webkit\\.css)",
                "$1" + replacement + "$2");

Result will equal http://example.com/stylesheets/webkit.css.

Another option using look arounds:

String result = input.replaceAll("(?<=http://).*(?=/stylesheets/webkit\\.css)",
                                 replacement);

which says "replace everything in between http:// and /stylesheets/webkit.css with replacement.

edited Aug 21, 2011 at 19:27

answered Aug 21, 2011 at 19:21

aioobe

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