while ($dna1 =~ s/\s/GA{ACT}TC/g){
print "Found GA{ACT}TC at", pos($dna1)-4, "\n";
}

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If you've read pos then you will notice it says 'Returns the offset of where the last "m//g" search left off' but you are not using m//g.

Your message says "Found GA{ACT}TC" but your search pattern is /\s/ which is a single whitespace character.

By "pos($dna1)-4" I assume that you want the start of the pattern but a single whitespace character is only one character long and the string "GA{ACT}TC" is 9 characters long?

In reply to Re: RegEx and Packaging Name Problem by jwkrahn
in thread RegEx and Packaging Name Problem by blarsen

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