Question

I am looking for a regex to parse the part between a = and an & to get the first url variable.

Example url:

http://vandooren.be?v=123456&test=123

I need to get the 123456 from the string.

My last try was

var pattern:RegExp = /\=|\&/;
var result:Array = pattern.exec(dg.selectedItem.link[0]);
trace(result.index, " - ", result);

But i am still getting errors.

Answer 1

try this follow code.

var myPattern:RegExp = /(?<==).+(?=&)/;   
var str:String = "http://vandooren.be?v=123456&test=123";
var result:Array = myPattern.exec(str);
trace(result[0]); //123456

---

var myPattern:RegExp = /(?<==).+(?=&)/;   
var str:String = "youtube.com/watch?v=nCgQDjiotG0&feature=youtube_gdata";
var result:Array = myPattern.exec(str);
trace(result[0]); //nCgQDjiotG0

---

Assertions

foo(?=bar)  Lookahead assertion. The pattern foo will only match if followed by a match of pattern bar.
foo(?!bar)  Negative lookahead assertion. The pattern foo will only match if not followed by a match of pattern bar.
(?<=foo)bar Lookbehind assertion. The pattern bar will only match if preceeded by a match of pattern foo.
(?<!foo)bar Negative lookbehind assertion. The pattern bar will only match if not preceeded by a match of pattern foo.