提取字符中的數字.
var arr:String = "12ab23";
var p:RegExp = /[0-9]/g; //1,2,2,3
var p:RegExp = /[0-9]/g; //1,2,2,3
var p:RegExp = /[0-9][0-9]/g; //12,23
var p:RegExp = /\b[0-9][0-9]/g;//12
var p:RegExp = /[0-9][0-9]\b/g;//23
trace(arr.match(p));
/\d+/g |