Case-insensitive matching on urls.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4514 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/StringUtil.as

@@ -228,6 +228,6 @@ public class StringUtil
 
     /** A regular expression that finds URLs. */
     protected static const URL_REGEXP :RegExp =
-        new RegExp("(http|https|ftp)://\\S+");
+        new RegExp("(http|https|ftp)://\\S+", "i");
 }
 }