NAME - split sequences in fasta files by given regular expression

SYNOPSIS [options] <regex> <file>

  <regex> the split pattern in form of a perl regular expression
  <file>  input sequence file in fata format


  --help            brief help message
  --clean_seq       clean DNA sequence (mask unknown characters with N)
  --include_junk    sequence matched by <regex> will be included in the output
  --seq_f <file>    write the split sequences into <file>