There's not a built-in. The regexp approach is fine. If you want it to be a sub, just put it in a sub definition:
sub trim_white {
my $string = shift;
$string =~ s/^\s+//g;
$string =~ s/\s+$//g;
return $string;
}
# Usage example:
my $trimmed = trim_white( $untrimmed );
Update: For completeness's sake, it might be worth noting that on CPAN you can find String::Util, which includes a function called trim() that does exactly what you're talking about. ...it's been done. ;)
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