[ic] Filter question - Is this possible?

[Aftermarket Cellular]

Quoting Jon:

>How/where are you trying to use it?

I pasted the following code at the bottom of my catalog.cfg:

CodeDef before_colon Filter
CodeDef before_colon Routine <<EOR
sub {
	my ($val) = @_;
	$val =~ s/:.*//;
	return $val;
}
EOR

Then I placed the following line in the Title metatag on my flypage template:

[filter before_colon][item-description][/filter]

Quoting Rene:
>I assume that you have restarted/reeloaded your  catalg... If not, the do
>so. Check also the output of you catalog error-log.

I did restart interchange. I also checked my error log and I am receiving the 
following error:

Unknown filter before_colon


Thanks for everyone's help so far