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Re^2: transliteration d flag not working as expected

by AnomalousMonk (Archbishop)
on Jun 09, 2013 at 12:04 UTC ( #1037924=note: print w/replies, xml ) Need Help??

in reply to Re: transliteration d flag not working as expected
in thread transliteration d flag not working as expected

You could also do it with a single  s/// substitution, although it is messier and almost certainly slower than a double-tr/// approach:

>perl -wMstrict -le "my %xlate = qw(t f h l i i s p); ;; my $s = 'alters'; $s =~ s{ . }{ $xlate{${^MATCH}} // '' }xmsgpe; print qq{'$s'}; " 'fp'

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Re^3: transliteration d flag not working as expected
by LanX (Sage) on Jun 09, 2013 at 12:29 UTC
    Not sure if it's slower, 'tr///' doesn't allow variable interpolation.

    Using it twice in a DRY way means putting the pattern into a variable which leads to eval :(

    Because the transliteration table is built at compile time, ne +ither the SEARCHLIST nor the REPLACEMENTLIST are subjected to dou +ble quote interpolation. That means that if you want to use va +riables, you must use an eval():

    Cheers Rolf

    ( addicted to the Perl Programming Language)

      What I had in mind was that  s/// would be messier/slower if interpolation was unnecessary, as the OPed problem statement seemed to indicate. I agree that if interpolation becomes necessary,  s/// is almost certainly preferable to an eval approach.

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