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[web] Extracting a Number from a text string

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Let's say that q="12r"; Now there is no guarantee how many numbers there will be or how many characters after the numbers. How can I extract just the numbers from that expression?

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it really depends on the language. a simple regex like /\d*/ will work. how to do it exactly will depend on the language you use.

ruby: "12r".match(/\d*/)
php: preg_match('/\d*/',"12r", $match); // $match[0] contains the number
... the list goes on.

also a lot of languages will convert strings to integers and will just take the first series of digits it comes across (example ruby: "12r".to_i == 12)

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I was looking more for a built in javascript function that would do it. I can do it with php easily, but I'd rather find a way to do it with javascript only.

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