WITCH squiggle: Revision 5
Operators containing this character
When used inside regexes
~~ and !~~ inside a regular expression: cause a nested submatch to be performed.
Hyper operator and meta operator restrictions
Most hyper operators and meta operators have functional ~ forms.
Old, deprecated, or other language uses
=~ and !~ in Perl5 used to be for matching. Now it is ~~ (see above). =~ is always a syntax error in Perl6.