5.1.3 The Match-not-syntactic-class Operator (\Sclass)
This operator is similar to the match-syntactic-class operator except
that it matches any character whose syntactic class is not
represented by the specified character. `\Sclass' represents
this operator. For example, `w' represents the syntactic class of
word-constituent characters, so `\Sw' matches any character that is
not word-constituent.
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