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2 hours ago by

Hello,

I am trying to execute a very simple grep command, but I can't get it to work and I cannot figure out why. Here is exactly what I am doing:

echo 'ACTTTATTA' > myseq

cat myseq

ACTTTATTA

grep -E '^.{2}TTT' myseq

No results

I am trying to grep a sequence that has 3 Ts starting from the third nucleotide, just like the one I am creating above. But I get no output. The error seems to come from {2}, because I have been able to reproduce this behaviour only when I introduce {number} and it gets solved when I replace it by something else.

I have:

  • Tested it in a different computer

  • Tested it in google colab

  • Tested it in regex101 (it works as expected)

What am I doing wrong?



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