regex match everything between two different characters

Question

I want to match a string between (but not including) these two characters: ? and &

Example string:

localhost/path/doc.html?970441179&token=specialtoken&actionurl=/portletaction/01654/0112

So from the above I want to match the string 970441179

Answer 1

var str = "?samplestring&";
var patt = /[?]([^&]*)[&]/g;
var res = patt.exec(str)[1];

'res' is your desired result.