Capture regular expression parts as :character
Clarify test
Rename Rip::Compiler::ParseTreeNormalizer#normalize_string and #normalize_string_hash to be a bit more generic
Refactor Rip::Compiler::ParseTreeNormalizer to parse regular expression interpolation
Refactor Rip::Nodes::RegularExpression transform rule
Add test for transforming interpolation inside regular expression
Normalize regular expression interpolation as concatenation