#Initialize to first character of first field, no warnings
#Creates extra unneeded data.
($row->[15]) = $row->[0] =~ /(.)/;

#This appears to match undefined and sets it to "", warnings
#^ * matches null string many times in regex; marked by <--HERE in m/ (^ * <-- HERE $) / at convertACsv.pl line 86.
#Use of uninitialized value in substitution (s///) at convertACsv.pl line 86, <_GEN_0> line 1.
$row->[15] =~ s/ (^ *$) //gx;

#This appears to match undefined and sets it to "", warnings
#Use of uninitialized value in substitution (s///) at convertACsv.pl line 86, <_GEN_0> line 1.
$row->[15] =~ s/ (^z) //gx;
#oops, dropped the "\"
$row->[15] =~ s/ (^\z) //gx;

#Why doesn't one of these work?
($row->[15]) = "";
($row->[15]) = ("");