following LanX's steps
$_ = q(aaa; ; bbb ; "ccc ; ddd ;"  ee;e  ";"  fff ;);
s/(".+;.+"|;)/$1 ne ';' ? $1 : '&&'/ge;

[download]
outputs 
aaa&& && bbb && "ccc ; ddd ;"  ee;e  ";"  fff &&

[download]
so It fit the authors task, if he doesn't have any
of these constructions: 
; " ; " ; " ; " ;

[download]
seems to me that, these should be processed with toggles =_=
LanX's code for the author's task: 
$b = 0;
$_ = q(aaa; ; bbb ; "ccc ; ddd ;"  ee;e  ";"  fff ;);
$a = join '', map {$b =!$b if /"/; s/;/'&&'/ unless $b; $_} split //;

output:
aaa&& && bbb && "ccc ; ddd ;"  ee&&e  ";"  fff &&

[download]

In reply to Re: In place replace, ignoring between quotes by Lennotoecom
in thread In place replace, ignoring between quotes by Klainn

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