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44cc6f7350
There are two flavours of `match?`. If the receiver of `match?` has type String then the argument to `match?` is a regular expression. However, if the receiver of `match?` has type Regexp then the argument is the text. The role of receiver and argument flips depending on the type of the receiver, this caused a lot of false positives when looking for string-like literals that are used as a regular expression. This commit attempts to improve things by trying to determine whether the type of the receiver is known to be of type Regexp. In such cases we know that the argument is unlikely to be regular expression.