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  1. import re
  2. y=r"(?:AA[TCG]).{19}"
  3. x=raw_input('GET STRING:: ');
  4. l= re.findall(y,x)
  5. for x in l:
  6. print x
  7. print len(x)
Success #stdin #stdout 0.01s 7732KB
stdin
ATGGAATCTTGTGATTGCATTGACACGCCATGCCCTGGTGAAGAACTCTTAGTGAAATATCAGTATATCT
stdout
GET STRING:: AATCTTGTGATTGCATTGACAC
22
AAGAACTCTTAGTGAAATATCA
22