String To integer JavaScript

Question

I want to get the integer in this string xyzabc123.

Answer 1

You can replace everything that is not a number with a regex...

var number = 'xyzabc123'.replace(/[^\d]+/g, '');

See it on jsFiddle.

Update

To protect yourself from a string like this: b0ds72 which will be interpreted as octal, use parseInt() (or Number(); Number is JavaScript's number type, like a float.)

number = parseInt(number, 10);

• aWebDeveloper: what is the ending g in your regular expression
• alex: @Web Developer Global match flag.
• alex: @Web Developer It will keep matching to the end of the string, not on first match.

Answer 2

to add to alex's answer if you wanted to get a functional integer

var number = 'xyzabc123'.replace(/[^\d]+/, '');
number = parseInt(number,10);

• alex: What do you mean by a functional integer?
• jondavidjohn: I mean a value of actual integer type, you're example does not convert a string to an integer, it changes a string to a string (of number characters).
• Nick Craver: you should always use a radix with parseInt, e.g. parseInt(number, 10) otherwise some numbers, beginning with 0 for example, will be converted incorrectly.