Perl 6
WITCH squiggle: Revision 1

~ As an infix operator: concatinate or stitch characters together, instead of . in perl5. Specification

Operators containing this character

~= String Append, the post-assignment mutant form of ~
~~ The Smart Match operator
~~ and !~~ inside a regular expression: cause a nested submatch to be performed.
<~~ inside a regular expression starts an extensible metasyntax for sub-pattern re-use (and must be closed with >)

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.


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