Backreference 'aa': valid
Backreference 'ab': string_pattern_mismatch
ClassComment 'a#a': valid
ClassComment 'b': string_pattern_mismatch
CommentedSyntax 'abc': valid
CommentedSyntax 'ABC': string_pattern_mismatch
EscapedHash 'a#b': valid
EscapedHash 'ab': string_pattern_mismatch
ClassEscapedHash 'a#b': valid
ClassEscapedHash 'c': string_pattern_mismatch
AcceptedVerbose 'abc': valid
AcceptedVerbose 'ABC': string_pattern_mismatch
MidPatternFlag 'ab': valid
MidPatternFlag 'ac': string_pattern_mismatch
ScopedVerbose 'abc': valid
ScopedVerbose 'ABC': string_pattern_mismatch
