Method List
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    #<< Regexp::Expression::Subexpression
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    #<< Regexp::Expression::SequenceOperation
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    #<< Regexp::Expression::Conditional::Expression
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    #<< Regexp::Expression::CharacterSet::Range
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    #add_sequence Regexp::Expression::SequenceOperation
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    #add_sequence Regexp::Expression::Conditional::Expression
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    add_to Regexp::Expression::Sequence
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    #ascii_classes? Regexp::Expression::Base
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    at_levels Regexp::Expression::Sequence
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    #attributes Regexp::Expression::Base
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    #branches Regexp::Expression::Conditional::Expression
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    build Regexp::Expression::Root
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    build_token Regexp::Expression::Root
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    #capturing? Regexp::Expression::Group::Base
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    #capturing? Regexp::Expression::Group::Capture
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    #case_insensitive? Regexp::Expression::Base
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    #char Regexp::Expression::EscapeSequence::AbstractMetaControlSequence
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    #char Regexp::Expression::EscapeSequence::Octal
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    #char Regexp::Expression::EscapeSequence::CodepointList
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    #char Regexp::Expression::EscapeSequence::Base
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    #char Regexp::Expression::EscapeSequence::Literal
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    #chars Regexp::Expression::EscapeSequence::CodepointList
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    #close Regexp::Expression::CharacterSet
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    #closed Regexp::Expression::CharacterSet
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    #coded_offset Regexp::Expression::Base
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    #codepoint Regexp::Expression::EscapeSequence::Base
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    #codepoint Regexp::Expression::EscapeSequence::Meta
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    #codepoint Regexp::Expression::EscapeSequence::MetaControl
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    #codepoint Regexp::Expression::EscapeSequence::CodepointList
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    #codepoint Regexp::Expression::EscapeSequence::Control
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    #codepoints Regexp::Expression::EscapeSequence::CodepointList
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    #comment? Regexp::Expression::Group::Comment
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    #comment? Regexp::Expression::Group::Base
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    comparable_version Regexp::Syntax
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    #complete? Regexp::Expression::CharacterSet::Range
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    #condition Regexp::Expression::Conditional::Expression
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    #condition= Regexp::Expression::Conditional::Expression
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    #conditional_level Regexp::Expression::Base
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    const_missing Regexp::Syntax
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    #default_classes? Regexp::Expression::Base
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    #dig Regexp::Expression::Subexpression
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    #each Regexp::MatchLength
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    #each_expression Regexp::Expression::Subexpression
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    #effective_number Regexp::Expression::Backreference::NumberRelative
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    #emit Regexp::Scanner
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    #endless_each Regexp::MatchLength
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    #excludes Regexp::Syntax::Base
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    #expressions Regexp::Expression::Subexpression
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    fallback_version_class Regexp::Syntax
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    #features Regexp::Syntax::Base
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    #fixed? Regexp::MatchLength
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    #flat_map Regexp::Expression::Subexpression
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    #free_spacing? Regexp::Expression::Base
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    #full_length Regexp::Expression::Base
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    #greedy? Regexp::Expression::Base
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    #implementations Regexp::Syntax::Base
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    #implements Regexp::Syntax::Base
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    #implements! Regexp::Syntax::Any
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    #implements! Regexp::Syntax::Base
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    #implements? Regexp::Syntax::Base
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    #implements? Regexp::Syntax::Any
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    #include? Regexp::MatchLength
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    inherit_from_version Regexp::Syntax
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    #initialize Regexp::Syntax::NotImplementedError
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    #initialize Regexp::Expression::Backreference::Number
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    #initialize Regexp::Syntax::Any
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    #initialize Regexp::Syntax::Base
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    #initialize Regexp::Expression::Sequence
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    #initialize Regexp::Expression::Subexpression
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    #initialize Regexp::Expression::Group::Named
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    #initialize Regexp::Expression::Base
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    #initialize Regexp::MatchLength
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    #initialize Regexp::Expression::Backreference::NumberRecursionLevel
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    #initialize Regexp::Syntax::V2_3_0
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    #initialize Regexp::Scanner::UnknownUnicodePropertyError
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    #initialize Regexp::Scanner::InvalidGroupError
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    #initialize Regexp::Scanner::PrematureEndError
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    #initialize Regexp::Scanner::ValidationError
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    #initialize Regexp::Scanner::InvalidSequenceError
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    #initialize Regexp::Scanner::InvalidGroupOption
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    #initialize Regexp::Parser::UnknownTokenError
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    #initialize Regexp::Parser::UnknownTokenTypeError
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    #initialize Regexp::Expression::Conditional::TooManyBranches
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    #initialize Regexp::Scanner::InvalidBackrefError
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    #initialize Regexp::Expression::Backreference::NameRecursionLevel
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    #initialize Regexp::Expression::Root
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    #initialize Regexp::Syntax::V2_6_2
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    #initialize Regexp::Syntax::V2_6_3
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    #initialize Regexp::Syntax::InvalidVersionNameError
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    #initialize Regexp::Syntax::UnknownSyntaxNameError
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    #initialize Regexp::Syntax::V1_8_6
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    #initialize Regexp::Expression::Quantifier
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    #initialize Regexp::Expression::Backreference::Name
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    #initialize Regexp::Syntax::V2_6_0
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    #initialize Regexp::Expression::CharacterSet
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    #initialize Regexp::Syntax::V2_2_0
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    #initialize Regexp::Syntax::V1_9_3
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    #initialize Regexp::Syntax::V2_4_0
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    #initialize Regexp::Syntax::V2_4_1
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    #initialize Regexp::Syntax::V2_5_0
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    #initialize Regexp::Syntax::V1_9_1
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    #initialize Regexp::Syntax::V2_0_0
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    #initialize_clone Regexp::Expression::Base
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    #initialize_clone Regexp::Expression::Group::Named
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    #initialize_clone Regexp::Expression::Subexpression
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    #initialize_clone Regexp::Expression::Quantifier
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    #inner_match_length Regexp::Expression::Subexpression
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    inspect Regexp::Syntax::Base
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    #inspect Regexp::MatchLength
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    #is? Regexp::Expression::Base
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    #length Regexp::Token
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    #level Regexp::Expression::Base
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    #lex Regexp::Lexer
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    lex Regexp::Lexer
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    long_prop_map Regexp::Scanner
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    #match Regexp::Expression::Base
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    #match? Regexp::Expression::Base
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    #match_length Regexp::Expression::Subexpression
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    #match_length Regexp::Expression::EscapeSequence::CodepointList
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    #match_length Regexp::Expression::Group::Absence
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    #match_length Regexp::Expression::Backreference::Base
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    #match_length Regexp::Expression::Literal
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    #max Regexp::Expression::Quantifier
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    #max Regexp::MatchLength
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    #merge Regexp::Expression::WhiteSpace
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    #min Regexp::Expression::Quantifier
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    #min Regexp::MatchLength
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    #minmax Regexp::MatchLength
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    #mode Regexp::Expression::Quantifier
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    #multiline? Regexp::Expression::Base
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    #name Regexp::Expression::PosixClass
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    #name Regexp::Expression::UnicodeProperty::Base
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    #name Regexp::Expression::Backreference::Name
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    #name Regexp::Expression::Group::Named
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    #negate Regexp::Expression::CharacterSet
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    #negative Regexp::Expression::CharacterSet
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    #negative? Regexp::Expression::UnicodeProperty::Base
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    #negative? Regexp::Expression::PosixClass
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    #nesting_level Regexp::Expression::Base
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    new Regexp::Syntax
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    #next Regexp::Token
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    #normalize Regexp::Syntax::Base
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    #normalize_backref Regexp::Syntax::Base
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    #normalize_group Regexp::Syntax::Base
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    #number Regexp::Expression::Backreference::Number
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    #number Regexp::Expression::Group::Capture
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    #number_at_level Regexp::Expression::Group::Capture
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    of Regexp::MatchLength
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    #offset Regexp::Expression::Base
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    #offset Regexp::Token
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    #one_of? Regexp::Expression::Base
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    #option_changes Regexp::Expression::Group::Options
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    #options Regexp::Expression::Base
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    parse Regexp::Parser
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    #parse Regexp::Parser
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    parsed Regexp::Expression
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    #possessive? Regexp::Expression::Base
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    #previous Regexp::Token
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    #quantified? Regexp::Expression::Base
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    #quantifier Regexp::Expression::Base
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    #quantifier_affix Regexp::Expression::Base
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    #quantify Regexp::Expression::Sequence
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    #quantify Regexp::Expression::FreeSpace
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    #quantify Regexp::Expression::Base
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    #quantity Regexp::Expression::Base
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    #recursion_level Regexp::Expression::Backreference::NumberRecursionLevel
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    #recursion_level Regexp::Expression::Backreference::NameRecursionLevel
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    #reference Regexp::Expression::Conditional::Condition
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    #reference Regexp::Expression::Conditional::Expression
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    #referenced_expression Regexp::Expression::Conditional::Condition
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    #referenced_expression Regexp::Expression::Backreference::Base
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    #referenced_expression Regexp::Expression::Conditional::Expression
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    #reluctant? Regexp::Expression::Base
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    #repetitions Regexp::Expression::Base
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    scan Regexp::Scanner
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    #scan Regexp::Scanner
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    #set_level Regexp::Expression::Base
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    short_prop_map Regexp::Scanner
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    #shortcut Regexp::Expression::UnicodeProperty::Base
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    specified_versions Regexp::Syntax
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    #starts_at Regexp::Expression::CharacterSet::Range
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    #starts_at Regexp::Expression::Sequence
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    #starts_at Regexp::Expression::SequenceOperation
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    #strfregexp Regexp::Expression::Base
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    #strfregexp_tree Regexp::Expression::Subexpression
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    supported? Regexp::Syntax
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    #te Regexp::Expression::Subexpression
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    #terminal? Regexp::Expression::Base
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    #text Regexp::Expression::Quantifier
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    #text Regexp::Expression::Base
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    #to_h Regexp::Expression::Subexpression
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    #to_h Regexp::Expression::Quantifier
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    #to_h Regexp::Token
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    #to_re Regexp::Expression::Base
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    #to_re Regexp::MatchLength
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    #to_s Regexp::Expression::CharacterSet::Range
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    #to_s Regexp::Expression::Subexpression
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    #to_s Regexp::Expression::Group::Comment
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    #to_s Regexp::Expression::Group::Base
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    #to_s Regexp::Expression::CharacterSet
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    #to_s Regexp::Expression::Quantifier
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    #to_s Regexp::Expression::Base
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    #to_s Regexp::Expression::Conditional::Expression
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    #to_s Regexp::Expression::SequenceOperation
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    #token Regexp::Expression::Quantifier
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    #token Regexp::Expression::Base
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    #traverse Regexp::Expression::Subexpression
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    #ts Regexp::Expression::Base
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    #type Regexp::Expression::Base
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    #type? Regexp::Expression::Base
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    #unicode_classes? Regexp::Expression::Base
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    #unquantified_clone Regexp::Expression::Base
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    version_class Regexp::Syntax
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    version_const_name Regexp::Syntax
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    warn_if_future_version Regexp::Syntax