//i does work on accented characters ...usually. When it doesn't, you can force it to using one of the following methods:
A very likely possibility is that you don't actually have "Ú" or "╔" in your string or in your code due to forgetting to decode, since you don't normally need the above.
use utf8; # Source file is encoded using UTF-8
print "Ú" =~ /╔/i ?1:0,"\n"; # 1
print "╔" =~ /Ú/i ?1:0,"\n"; # 1
print "Ú" =~ /\w/ ?1:0,"\n"; # 1
print "╔" =~ /\w/ ?1:0,"\n"; # 1
To answer your question, you could go about doing that by lowercasing non-ASCII characters using s/([^\x00-\x7F])/lc($1)/eg; with one of the above used.
use utf8; # UTF-8 code
use open ':std', ':encoding(UTF-8)'; # UTF-8 terminal
$_ = "LES MIS╔RABLES";
s/([^\x00-\x7F])/lc($1)/eg; # LES MISÚRABLES
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