In the spirit of TIMTOWTDI, here's yet another method to handle this, one that I have often used with complex situations. The code might look something like this (untested).
my $replace = sub {
my $prefix = $1;
#COLLECT YOUR PAIRS SOMEHOW; A m// OR s/// ALSO POSSIBLE
my @pairs = split(/(.*?[=].*?)(?:[,])?/, $prefix);
#DEAL WITH PAIRS HOWEVER YOU LIKE
push @allpairs, @pairs;
#RETURN WHATEVER REPLACEMENT YOU LIKE FOR $prefix
return $prefix; #NO CHANGE AT ALL
};
#CAPTURE EVERYTHING UP TO, NOT INCLUDING, "batch ="
$syspbuff =~ s/(.*?)(?=batch\s*=)/$replace->()/em;
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