echo 1234.45.67.890 | perl -ne'split /\./; printf "%X%X%X%X",@_'

From split's documentation:

In scalar context, returns the number of fields found and splits into the @_ array. Use of split in scalar context is deprecated, however, because it clobbers your subroutine arguments.
Why not have split in list context, and forget about @_?
printf "...", split /\./

[download]

U28geW91IGNhbiBhbGwgcm90MTMgY
W5kIHBhY2soKS4gQnV0IGRvIHlvdS
ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
geW91IHNlZSBpdD8gIC0tIEp1ZXJk

In reply to Re: Re: extracting variables from regex by Juerd
in thread extracting variables from regex by Anonymous Monk

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