Get content inside (brackets)


I am trying to make a javascript function that checks if the input containes brackets, and then use the content inside the brackets. The string should then be shortened and made into a number I can use to add another number.

input: test string(+100abc)
output: 100

Example 2:
input: anotherstring (+123.45abc)
output: 123.45

Thanks in advance!
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<script type="text/javascript">
var str = "sdfsdf(9303sdf)";
var pos = str.indexOf("(") + 1;
if (!pos) { /*do something if bracket not found*/ }
var str = str.substring(pos, str.indexOf(")", pos));
Try below one.

var input = 'anotherstring (+123.45abc)';
var output = input.replace(/[^0-9\.]+/g, '');

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try :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script language="javascript">
	var s = "anotherstring (+123.45abc)";
	str = s.indexOf("(");
	end = s.lastIndexOf(")");
	myStr = "Not found!";
	if( str>=0 && end>0 && str<end ) {
		myStr = s.substring( str+1, end ).replace(/[^0-9|.]*/g, '');
	alert( myStr );

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