Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

in a tr/// what do the /C and /U options do and why aren't they documented?

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Re: extra options in tr///
by extremely (Priest) on Feb 21, 2001 at 08:22 UTC
    For installed versions of perl that support them, look in perlop with perldoc perlop and you will find this in there. (you will find that the docs on-site are not from Perl 5.6): 
    PERLOP(1)      User Contributed Perl Documentation      PERLOP(1)


               Options:

                   c   Complement the SEARCHLIST.
                   d   Delete found but unreplaced characters.
                   s   Squash duplicate replaced characters.
                   U   Translate to/from UTF-8.
                   C   Translate to/from 8-bit char (octet).

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    --
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    honk() if $you->love(perl)

[reply]
[d/l]
      Don't get too friendly with tr///U and tr///C, however, since they were removed from the language in June, a few months after 5.6.0 was released.

      p5p archives: [PATCH] Eliminate tr///[CU][CU]

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