Quantifier follows nothing in regex; marked by <-- HERE in m/* <-- HER
+E */ at gn gxsmig_mapextver0.1.pl
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That error message means exactly what it says. There is a quantifier (in your case *) that follows nothing, that means it is at the start of the regular expression. A regular expression cannot start with *, ? or +.

My guess is that $mappingfield starts with *. Maybe you want to read perlre and use the \Q and \E escapes to properly quote $mappingfield for use in a regular expression:

    if ($line2 =~ /\Q$mappingfield\E/) { ...
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