logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [3303:3381]:
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              else
                @index = i0
                r0 = nil
              end
            end
          end
        end
      end
    end

    node_cache[:compare_operator][start_index] = r0

    r0
  end

  module RegexpExpression0
    def rvalue
      elements[0]
    end

    def cs1
      elements[1]
    end

    def regexp_operator
      elements[2]
    end

    def cs2
      elements[3]
    end

  end

  def _nt_regexp_expression
    start_index = index
    if node_cache[:regexp_expression].has_key?(index)
      cached = node_cache[:regexp_expression][index]
      if cached
        node_cache[:regexp_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0, s0 = index, []
    r1 = _nt_rvalue
    s0 << r1
    if r1
      r2 = _nt_cs
      s0 << r2
      if r2
        r3 = _nt_regexp_operator
        s0 << r3
        if r3
          r4 = _nt_cs
          s0 << r4
          if r4
            i5 = index
            r6 = _nt_string
            if r6
              r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
              r5 = r6
            else
              r7 = _nt_regexp
              if r7
                r7 = SyntaxNode.new(input, (index-1)...index) if r7 == true
                r5 = r7
              else
                @index = i5
                r5 = nil
              end
            end
            s0 << r5
          end
        end
      end
    end
    if s0.last
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logstash-core/lib/logstash/config/grammar.rb [3327:3405]:
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              else
                @index = i0
                r0 = nil
              end
            end
          end
        end
      end
    end

    node_cache[:compare_operator][start_index] = r0

    r0
  end

  module RegexpExpression0
    def rvalue
      elements[0]
    end

    def cs1
      elements[1]
    end

    def regexp_operator
      elements[2]
    end

    def cs2
      elements[3]
    end

  end

  def _nt_regexp_expression
    start_index = index
    if node_cache[:regexp_expression].has_key?(index)
      cached = node_cache[:regexp_expression][index]
      if cached
        node_cache[:regexp_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0, s0 = index, []
    r1 = _nt_rvalue
    s0 << r1
    if r1
      r2 = _nt_cs
      s0 << r2
      if r2
        r3 = _nt_regexp_operator
        s0 << r3
        if r3
          r4 = _nt_cs
          s0 << r4
          if r4
            i5 = index
            r6 = _nt_string
            if r6
              r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
              r5 = r6
            else
              r7 = _nt_regexp
              if r7
                r7 = SyntaxNode.new(input, (index-1)...index) if r7 == true
                r5 = r7
              else
                @index = i5
                r5 = nil
              end
            end
            s0 << r5
          end
        end
      end
    end
    if s0.last
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