Re^3: doing tr/// on-the-fly?

Okay, I didn't duplicate exactly what you said. The following code:

#!/usr/bin/env perl      

use strict;

my $s = 'eabcde';
my $t = $s;

print "$t\n";
$t =~ tr/abcd/efgh/;
print "$t\n";

print '*' x 4, $/;

my $search = 'abcd';
my $replace = 'efgh';

$t = $s;
print "$t\n";

eval "\$t =~ tr/$search/$replace/";

print "$search\n";
print "$replace\n";
print "$t\n";
[download]

...does give me the expected results:

eabcde
eefghe
****
eabcde
abcd
efgh
eefghe
[download]

Why the difference?

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Re^4: doing tr/// on-the-fly? by jwkrahn (Abbot) on Mar 18, 2010 at 01:43 UTC
Because: `eval { $t =~ tr/$search/$replace/; };` [download] is just normal perl code where there is no interpolation so '$' is replaced with '$' and 's' is replaced with 'r' and 'e' is replaced with 'e' and 'a' is replaced with 'p', etc. while using string eval interpolates the variables $search and $replace.	[reply] [d/l]