logstash-core/lib/logstash/config/grammar.rb [1290:1321]:
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  def _nt_string
    start_index = index
    if node_cache[:string].has_key?(index)
      cached = node_cache[:string][index]
      if cached
        node_cache[:string][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0 = index
    r1 = _nt_double_quoted_string
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
    else
      r2 = _nt_single_quoted_string
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r0 = r2
      else
        @index = i0
        r0 = nil
      end
    end

    node_cache[:string][start_index] = r0

    r0
  end
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logstash-core/lib/logstash/compiler/lscl/lscl_grammar.rb [1266:1297]:
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  def _nt_string
    start_index = index
    if node_cache[:string].has_key?(index)
      cached = node_cache[:string][index]
      if cached
        node_cache[:string][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
        @index = cached.interval.end
      end
      return cached
    end

    i0 = index
    r1 = _nt_double_quoted_string
    if r1
      r1 = SyntaxNode.new(input, (index-1)...index) if r1 == true
      r0 = r1
    else
      r2 = _nt_single_quoted_string
      if r2
        r2 = SyntaxNode.new(input, (index-1)...index) if r2 == true
        r0 = r2
      else
        @index = i0
        r0 = nil
      end
    end

    node_cache[:string][start_index] = r0

    r0
  end
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