Binary =~
binds a
scalar expression to a pattern match, substitution, or translation.
These operations search or modify the string $_
by default.
Binary !~
is just
like =~
except the return value
is negated in the logical sense. The following expressions are
functionally equivalent:
$string !~ /pattern
/ not $string =~ /pattern
/
see Section 4.6 later in this chapter.
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