I see. I would expect the strings coming in to contain the characters to operate on, not strings that Perl can turn into the characters to operate on by evaluating them.

The \b is tricky, as I can use it to get three different results from my three subroutines: 

# Add this to the list of cases:

    [ "a\b\\b" => '\\/',  'xy',  "a\bxb"]

# Results:

not ok 22 - simulate
#   Failed test 'simulate'
#   at ./2.pl line 64.
#          got: 'xb'
#     expected: 'xb'
ok 23 - cheat
Replacement list is longer than search list at (eval 45) line 1.
not ok 24 - use
#   Failed test 'use'
#   at ./2.pl line 66.
#          got: '\b'
#     expected: 'xb'

[download]

Switching to Test2::V0 explains the test 22: 

not ok 22 - simulate
# Failed test 'simulate'
# at ./2.pl line 64.
# +-------+----+-------+
# | GOT   | OP | CHECK |
# +-------+----+-------+
# | a\bxb | eq | xb    |
# +-------+----+-------+

[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^6: Transform ASCII into UniCode (escape_metas) by choroba
in thread Transform ASCII into UniCode by Perlian

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