Never mind I found the solution.

Great. Then you should either update your original post with the solution (while leaving the problem statement intact), or you should post a follow-up. But you should never "blank" your node - it's inconsiderate to those who took the time to respond to the original question, and it provides no benefit to those who come after you with the same question. (See: All your node are belong to us)

my ($n) = $s =~ /#EC2_([0-9]+)/;
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