Note that almost all properties are immune to case-insensitive matching.
That is, adding a C</i> regular expression modifier does not change what
-they match. There are two sets that are affected. The first set is
+they match. But there are two sets that are affected. The first set is
C<Uppercase_Letter>,
C<Lowercase_Letter>,
and C<Titlecase_Letter>,
$, = "\t| ";
$a =~ m'[$,]'; # single-quotish: matches '$' or ','
$a =~ q{[$,]}' # same
- $a =~ m/[$,]/; # double-quotish: matches "\t", "|", or " "
+ $a =~ m/[$,]/; # double-quotish: Because we made an
+ # assignment to $, above, this now
+ # matches "\t", "|", or " "
Characters that may carry a special meaning inside a character class are:
C<\>, C<^>, C<->, C<[> and C<]>, and are discussed below. They can be