how to extract floating numbers from strings in javascript

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You can use the regex /[+-]?\d+(\.\d+)?/g in conjunction with String.match() to parse the numbers and Array.map() to turn them into floats:

var regex = /[+-]?\d+(\.\d+)?/g;

var str="<tag value="20.434" value1="-12.334" />";
var floats = str.match(regex).map(function(v) { return parseFloat(v); });
console.log(floats);

var str2 = '20.434 -12.334';
var floats2 = str2.match(regex).map(function(v) { return parseFloat(v); });
console.log(floats2);

var strWithInt = "200px";
var ints = strWithInt.match(regex).map(function(v) { return parseFloat(v); });
console.log(ints);

See demo code here.

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