> my intention was to implement a sub tri = "transliterate interpolated" which allowed to write tri($input,$left,$right) and implemented $input =~ tr/LEFT/RIGHT/ while sticking close to tr's behaviour but without breaking.

That's more complicated than I thought because of the special nature of tr's arguments. :(

double-quotes allow interpolation and escape codes, single-quotes don't

  DB<76> p "a\bc"
c
  DB<77> p length "a\bc"
3
  DB<78> p 'a\bc'
a\bc
  DB<79> p length 'a\bc'
4
  DB<80> p 'a\b' eq 'a\\b'
1

[download]

But tr forbids interpolation while allowing escape codes

  DB<80> say '$l' =~ tr/$l/xyz/r    # no interpolation
xy

  DB<81> say "a\b" =~ tr/a\b/xyz/r  # but escape codes
xy

[download]

This makes evaling tr in a predictable way far too complicated.

Just escaping delimiters won't do, if escape codes are involved.

I think it's wise to give it up here.

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

In reply to Re^8: Transform ASCII into UniCode (escape_metas) by LanX
in thread Transform ASCII into UniCode by Perlian

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