Extract first numeric string

[blkskull]

Hi all:
I new here and also new to javascript so I hope you'll be patient if I ask dumb questions. I have a text box with a static value of $2.99 and I want to extract just the 2.99 value and multiply it by a quantity to get a total. While I was searching for something completely different the other day I came across function(I think) which it said would extract the first numeric string in a string including decimal places if there were any. The example it gave was if you had a string of "a62.99retail" it would extract "62.99". The thing is I can't remember what the function was called or where I found it, if anyone could tell me what this function is or a similar one it would greatly appreciated.

[MikeFoster]

I did this quickly but I think it works ok. Using a RegEx might be better - not sure.

function extractFloat(s)
{
  var c, i = 0, v = 0;
  do {
    c = s.charAt(i++);
  } while (i < s.length && ((c < '0' || c > '9') && c != '.'));
  if (i < s.length) {
    v = parseFloat(s.substr(i-1));
  }
  return v;
}

[stereofrog]

alert("a62.99retail".match(/\d+(\.\d+)?/)[0])

[MikeFoster]

Aha! Thanks stereofrog!