# File lib/new_relic/agent/database/postgres_explain_obfuscator.rb, line 17
        def obfuscate(explain)
          # First, we replace all single-quoted strings.
          # This is necessary in order to deal with multi-line string constants
          # embedded in the explain output.
          #
          # Note that we look for both single or double quotes but do not
          # replace double quotes in order to avoid accidentally latching onto a
          # single quote character embedded within a quoted identifier (such as
          # a table name).
          #
          # Note also that we make no special provisions for backslash-escaped
          # single quotes (\') because these are canonicalized to two single
          # quotes ('') in the explain output.
          explain.gsub!(QUOTED_STRINGS_REGEX) do |match|
            match.start_with?('"') ? match : '?'
          end

          # Now, mask anything after the first colon (:).
          # All parts of the query that can appear in the explain output are
          # prefixed with "<label>: ", so we want to preserve the label, but
          # remove the rest of the line.
          explain.gsub!(LABEL_LINE_REGEX,   '\1?')
          explain
        end