Well, you can simplify the translate to a single line:

use strict;
use warnings;

my $string = "aabbzzb";
my $oldchars = "//; print `dir *.*`; \\\$string =~ tr/";

eval "\$string =~ tr/$oldchars//d";
print $string; #will print zz

[download]

but as you may notice from the sample $oldChars string a savy user could take advantage of the string eval to do interesting stuff.

Probably you would be better to use a regex:

$string =~ s/[$oldchars]//g;

[download]

which at least is a little harder to subvert. Better still would be to sanitise $oldchars before it is used in the regex, but how you do that depends a great deal on what is appropriate in oldChars.

Perl reduces RSI - it saves typing

In reply to Re: deleting characters from a string but the characters are in a variable by GrandFather
in thread deleting characters from a string but the characters are in a variable by Anonymous Monk

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