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var str = "[color:red][font-size:16px]addddddddddddddddddddddddd[/font-size][/color]";
var s = str.replace(/(:)(.*?)(\])/g, "$110px$3");
alert(s);
Pattern p = Pattern.compile(":(.*?)\\]");
Matcher m = p.matcher(detail);
while (m.find()) {
System.out.println(m.group(1));
}