# Remove extraneous characters, make it one big long string to use sub
+str position on it
$genome =~ s/[\d\r\n\s]+//g;

[download]
The \s character class includes the characters \r and \n so including them is superfluous. If you want efficiency then use tr/// instead of s///: 
# Remove extraneous characters, make it one big long string to use sub
+str position on it
$genome =~ tr/0-9 \t\f\n\r//d;

[download]

In reply to Re: Genome UV Mutation Script -- Critique by jwkrahn
in thread Genome UV Mutation Script -- Critique by c4onastick

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