$str =~ s#/## for 1,2;
for example. But these assume you slurp the entire file into a string. Perhaps you are doing a perl -pe kind of thing...
perl -i.old -pe '$sawSlash++ && s#/## if m#/#'
(updated again. Thanks, blakem. I added "$str =~" to match what I was thinking and what I had tested.)
(sààaaaà x y z aziez,s $e $s deedeydi,t $ex,print)
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