Kenosis
User
Mar 26, 2013, 6:38 PM
Post #2 of 4
(12221 views)
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Re: [peol] Comparing two strings, ignoring a specific character
[In reply to]
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One way would be to substitute the "*" with a "." and do a match, like the following:
print "Same\n" if $string =~ /^ABC.E\z/;
You can see that the match is hard coded, so is not too helpful except to illustrate that the "." in a regex will match any char (almost :). However, the order of strings becomes a bit more complicated when comparing $comp and $comp2, since the latter has to be in // for the matching to succeed.
All of this can be taken care of in a subroutine to which you send any two of these strings to do a comparison test using 'wild-card' characters:
use strict;
use warnings;
my $string = "ABCDE";
my $comp = "ABC*E";
my $comp2 = "*BC*E";
print "Same\n" if wildSame( $string, $comp );
print 'Same' if wildSame( $string, $comp2 );
sub wildSame {
s/\*/./g for @_;
my ( $var1, $var2 );
my $count1 = $_[0] =~ tr/.//;
my $count2 = $_[1] =~ tr/.//;
if ( $count1 < $count2 ) {
$var1 = $_[0];
$var2 = $_[1];
}
else {
$var1 = $_[1];
$var2 = $_[0];
}
return $var1 =~ /^$var2\z/;
}
Output:
The subroutine first globally replaces any "*" with "." and then counts the number of "." in each of the two strings, so the one with more "." ends up in //.
Hope this helps!
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