Re^2: uc and German eszett "ß" (Unicode standard)

//i is equally acceptable.

That's why qr/(?<=ss)x/ui fails in versions of Perl without experimental (and buggy) variable look-behinds. /u is added by use feature qw( unicode_strings ); since 5.14, and thus by use v5.14; and higher.

Also,

$ perl -Mre=debug -e'qr/[abc\xDF]/ui'
Compiling REx "[abc\xDF]"
~ tying lastbr BRANCH (4) to ender TAIL (15) offset 11
~ tying lastbr BRANCH (1) to ender END (16) offset 15
Final program:
   1: BRANCH (4)
   2:   EXACTFUP <ss> (16)
   4: BRANCH (FAIL)
   5:   ANYOF[ABCabc] (16)
  15: TAIL (16)
  16: END (0)
minlen 1
Freeing REx: "[abc\xDF]"
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Re^3: uc and German eszett "ß" (Unicode standard) by LanX (Saint) on Feb 04, 2022 at 17:08 UTC
I think `fc` and `//i` should have the same inner semantics. But `//i` doesn't help in our case since we needed hash-keys. Anyway this was already solved on another level ... Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^4: uc and German eszett "ß" (Unicode standard) by ikegami (Patriarch) on Feb 05, 2022 at 22:04 UTC
I think `fc` and `//i` should have the same inner semantics. They do. That's literally the point of the message to which you replied. Anyway this was already solved on another level ... I wasn't proposing a solution; I was contradicting the claim that «fc is the only acceptable solution for comparing "case insensitive strings".»	[reply] [d/l] [select]
Re^5: uc and German eszett "ß" (Unicode standard) by LanX (Saint) on Feb 05, 2022 at 22:13 UTC
> fc is the only acceptable solution my point was: if its the same, there is only one way > That's literally the point ... Let's agree to agree. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re^6: uc and German eszett "ß" (Unicode standard) by ikegami (Patriarch) on Feb 06, 2022 at 05:02 UTC