docs: def parse_primers(self, primers=None, mismatches=0, revcompl=False):
      """This functions starts with self because it's 
      meant as an extension to the FASTA class."""
      # Default primers #
      if primers is None: primers = self.primers
      # Case straight #
      if not revcompl:
          fwd_regex = regex.compile("(%s){s<=%i}" % (primers.fwd_pattern, mismatches))
          rev_regex = regex.compile("(%s){s<=%i}" % (primers.rev_pattern, mismatches))
          generator = (ReadWithPrimers(r, fwd_regex, rev_regex) for r in self.parse())
      # Case revcompl #
      if revcompl:
          fwd_regex = regex.compile("(%s){s<=%i}" % (primers.fwd_pattern,          mismatches))
          rev_regex = regex.compile("(%s){s<=%i}" % (primers.rev_pattern_revcompl, mismatches))
          generator = (ReadWithPrimersRevCompl(r, fwd_regex, rev_regex) for r in self.parse())
      # Return #
      return GenWithLength(generator, len(self))