in reply to Re: Comparison by position and value
in thread Comparison by position and value

That doesn't work as is? 

#! perl -slw
use strict;

sub compatible {
    my ($s1, $s2) = @_;
    y/_/\0/c for $s1, $s2;
    !(($s1 | $s2)=~y/\0//);
}

printf "%s v %s ? %s\n", @$_, compatible( @$_ ) ? 1 : 0 
    for [ qw[ _8__3__19 48____7__ ] ],  # good
        [ qw[ _8__3__19 4_8___7__ ] ],  # bad
        [ qw[ _8__3__19 48_____7_ ] ];  # bad
        
__END__
[11:18:29.65] P:\test>test
_8__3__19 v 48____7__ ? 0
_8__3__19 v 4_8___7__ ? 1
_8__3__19 v 48_____7_ ? 0

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Examine what is said, not who speaks.
Silence betokens consent.
Love the truth but pardon error.

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Re^3: Comparison by position and value
by ambrus (Abbot) on Jan 02, 2005 at 11:25 UTC

    I don't see your problem: 

    _8__3__19 v
48____7__ ? 0
 ^

_8__3__19 v
4_8___7__ ? 1

_8__3__19 v
48_____7_ ? 0
 ^     ^

    [download]

    For these strings at least, the result is 0 iff there is a clash of two digits somewhere.

[reply]
[d/l]

      The first two strings are compatible, because they only overlap (contain a digit in the same place) where the digit is the same in both strings. Please see the 3 examples in the OP.

      Examine what is said, not who speaks.
      Silence betokens consent.
      Love the truth but pardon error.
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