I tested several patterns with Perl 5.14 and 5.16:

                                    Perl 5.14  Perl 5.16
"\x{17f}" =~ /(?iu)\w/            → match
"\x{17f}" =~ /(?iu)[\w]/          → match
"\x{17f}" =~ /(?iu)\W/            → unmatch
"\x{17f}" =~ /(?iu)[\W]/          → unmatch

"\x{17f}" =~ /(?ia)\w/            → unmatch ★
"\x{17f}" =~ /(?ia)[\w]/          → match ★   unmatch
"\x{17f}" =~ /(?ia)\W/            → match
"\x{17f}" =~ /(?ia)[\W]/          → match

"s" =~ /(?ia)\w/                  → match
"s" =~ /(?ia)[\w]/                → match
"s" =~ /(?ia)\W/                  → unmatch
"s" =~ /(?ia)[\W]/                → unmatch

"\x{17f}" =~ /(?ia)\p{ASCII}/     → unmatch
"\x{17f}" =~ /(?ia)[\p{ASCII}]/   → unmatch
"\x{17f}" =~ /(?ia)\P{ASCII}/     → match
"\x{17f}" =~ /(?ia)[\P{ASCII}]/   → match

"s" =~ /(?ia)\p{ASCII}/           → match
"s" =~ /(?ia)[\p{ASCII}]/         → match
"s" =~ /(?ia)\P{ASCII}/           → unmatch
"s" =~ /(?ia)[\P{ASCII}]/         → unmatch

"\x{17f}" =~ /(?iaa)\w/           → unmatch
"\x{17f}" =~ /(?iaa)[\w]/         → unmatch
"\x{17f}" =~ /(?iaa)\W/           → match
"\x{17f}" =~ /(?iaa)[\W]/         → match

★: Be careful with these results.

Regex matching errors when using \W character class and /i option #4

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