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It still didn't work as needed. That didn't remove the bases after the +N. However it did help me a lot and I managed to get a version which does indeed work as I want it (prints just to keep me in clear that what happens is indeed what should happen). I also added the || last to prevent that eternal loop you mentioned.

while (m/[+-]([0-9]+)/g) { printf "pos ($1): %d -> ",pos($_)-1; pos($_) -= length($1)+1; printf "pos ($1): %d\n",pos($_)-1; s/\G[+-]$1[ACGTNacgtn]{$1}// || last; }
So thanks for helping me out on this :).

Though on the whole. I think that the (??{...}) would be best choice as repositioning the pos() is probably not a good idea in general. Note that I included the negative as well as positive match in this as that would remove the next regex I have :).

In reply to Re^4: Regex fun by Hena
in thread Regex fun by Hena

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