If you lines contain other text besides the hex numbers, you can restrict the space removal to just between the hex numbers with: 
 $line =~ s{\b([a-f\d]{2})\s+(?=[a-f\d]{2}\b)}{$1}gi;

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In reply to Re^2: Help with parsing a string by pc88mxer
in thread Help with parsing a string by sdolancu

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