1"1.23-45/6$7.8,9".replace(/[^0-9]/g,'')
2
3// Response: "123456789"

1 thenum = "foo3bar5".match(/\d+/)[0] // "3"
2

1
2// Html: <span id="foo">280ms</span>
3
4var text = $('#foo').text();
5var number = parseInt(text, 10);
6alert(number);
7
8// parseInt('ms120'.replace(/[^0-9\.]/g, ''), 10);

1str = "hello123!"	
2str.match(/(\d+)/)[1]	//Best way to find first matching number in string ;)

1var regex = /\d+/g;
2var string = "Any string you want!";
3var matches = string.match(regex);  // creates array from matches
4
5if (matches){
6  // There is a digit in the string.
7} else {
8  // No Digits found in the string.
9}

1const num = 123; //> type number 123
2const str = num.toString(); //> type string "123"