Javascript how many characters replaced in a regex?

Posted by macca1 on Stack Overflow See other posts from Stack Overflow or by macca1
Published on 2010-03-17T20:33:54Z Indexed on 2010/03/17 21:01 UTC
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JavaScript

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regex

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jQuery

I am sanitizing an input field and manually getting and setting the caret position in the process. With some abstraction, here's the basic idea:

<input type="text" onkeyup"check(this)">

And javascript...

function check(element) {
  var charPosition = getCaretPosition(element);
  $(element).val( sanitize( $(element).val() ) );
  setCaretPosition(element, charPosition);
}

function sanitize(s) {
  return s.replace(/[^a-zA-Z0-9\s]/g, '');
}

This is working fine except when a character does actually get sanitized, my caret position is off by one. Basically I'd like a way to see if the sanitize function has actually replaced a character (and at what index) so then I can adjust the charPosition if necessary. Any ideas?

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