Counting specific characters in a check box

[Garabaldi]

Hi,

I need some javascript that will go through a textbox and tell me how many "a"s a user has entered and how many "b"s so on and so forth... I am not trying to count all the letters of the alphabet... I only need to concentrate on a certain few.

Thanks.

 

[adam0101]

<script>
[green]// Extends the String object.
// Returns the number of occurrences a string appears
// within a string or -1 if not found.
[/green]String.prototype.contains = function(str)
{
  var re = new RegExp(str, "gi");
  var result = this.match(re);
  return result ? result.length : -1;
}

[green]// Usage:[/green]
var myString = "abcabca";
alert(myString.contains("a"));

[green]// Or:[/green]
alert("abcabca".contains("a"));
</script>

Adam

http://adameslinger.blogspot.com/

 

[BillyRayPreachersSon]

Nice script, Adam... Having never got into regexp, I didn't realise you could use it to get a count of matches, too.

How goes it, anyway?

Dan

[tt]Dan's Page [blue]@[/blue] Code Couch

http://www.codecouch.com/dan/

[/tt]

 

[kaht]

Dan, both the match (string method) and exec (regexp method) will return an array based on the matches found in the string. They are pretty handy tools

-kaht

[small] <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <B> <P> <.</B>[/small]
[small](He's back)[/small]

 

[adam0101]

Thanks Dan,

I've been really busy. Not much time to post, but I still check in once in a while.



Adam

http://adameslinger.blogspot.com/