RegularExpressionPatternRule: validate preg_quote'd patterns #3270
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similar to how we added support for preg_quote'd patterns in ArrayShapeMatcher, we now re-use the logic in RegularExpressionPatternRule
Review at best commit by commit
commit 1: refactoring of ArrayShapeMatcher for re-use
commit 2: adjust RegularExpressionPatternRule to make use of the refactoring