Re: Converting to number doesn't always work...

[AnomalousMonk]

$N =~ tr|[0-9]||cd;

NB: The first field of the  tr/// operator (see Quote-Like Operators in perlop) is a search list, and it does not "know" about  [...] character classes (the search list is itself a kind of character class), so the  [ ] characters are among the "digit" characters which are not deleted.

c:\@Work\Perl\monks>perl -wMstrict -le
"my $n = 'abc[]1p2q3][xyz';
 $n =~ tr|[0-9]||cd;
 print qq{'$n'};
"
'[]123]['

Don't know about the rest of the question.

[harangzsolt33]

Oh, thanks for catching that!

my $A = 'abcd0123456789ABCDE[]{}()_=|?<>!@~%$/.-';

print "\nBEFORE: $A";

$A =~ tr|[0-9]||cd;

print "\nAFTER: $A";   # Output: 0123456789[]