code: def GenomicRangeFromString(range_string,payload=None,dir=None):
    
    m = re.match('^(.+):(\d+)-(\d+)$',range_string)
    if not m:  
      sys.stderr.write("ERROR bad genomic range string\n"+range_string+"\n")
      sys.exit()
    chr = m.group(1)
    start = int(m.group(2))
    end = int(m.group(3))
    return GenomicRange(chr,start,end,payload,dir)
docs: Constructor for a GenomicRange object that takes a string