...but that wouldn't interpolate where interpoplation is needed ($n1, $n2 and $ndiff).

(With single quotes, the resulting code such as ( ~$string1 & $string2 ) =~ tr[$ndiff][$ndiff] would count the total number of characters belonging to the set '$','n','d','i','f' — which is not what is intended here.) 

print 'f $ d d i $ n' =~ tr/$ndiff/$ndiff/;   # 7

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(Update: added sample code for the downvoter, who apparently didn't get it.)

In reply to Re^4: Returning transliteration from eval by Anonyrnous Monk
in thread Returning transliteration from eval by albert

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