> Why not test it directly, then?

I wanted to have a generic method for escaping selected metas while keeping others as is.

> what did I do wrong?

Took me a moment to understand (well guess) what's happening

Take case #2:

a\\b is internally the 3 char string a\b , so this escape b is untouched.

but you do a string interpolation for

eval "\$string =~ tr/$s/$r/r"

so whats happening is

  DB<57> say "a\\b" =~ tr/a\b/xyz/r # expected 'xyz'
x\b

  DB<58>

[download]

Actually I'm not sure what tr's interpretation of \b is here

Question is if your expectation was right, because the literal code gives my result (?)

C:\tmp\t_wperl>perl -E"say 'a\\b' =~ tr/a\b/xyz/r # expected 'xyz'"
x\b

C:\tmp\t_wperl>

[download]

update

I.o.W.

Your expectation is to have a 1-to-1 mapping of characters.

My expectation was to emulate tr like implemented and to catch injections.

It's a question of definition.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

In reply to Re^4: Transform ASCII into UniCode (escape_metas) by LanX
in thread Transform ASCII into UniCode by Perlian

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