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perl regex

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Error(s), warning(s):
Scalar value @_[1] better written as $_[1] at source_file.pl line 4.
Scalar value @_[0] better written as $_[0] at source_file.pl line 5.
Scalar value @_[0] better written as $_[0] at source_file.pl line 6.
Scalar value @a[$_] better written as $a[$_] at source_file.pl line 7.
Scalar value @_[0] better written as $_[0] at source_file.pl line 7.
Scalar value @_[0] better written as $_[0] at source_file.pl line 16.
Scalar value @_[0] better written as $_[0] at source_file.pl line 19.
Scalar value @_[0] better written as $_[0] at source_file.pl line 24.
Use of uninitialized value $2 in print at source_file.pl line 31.
Use of uninitialized value $2 in print at source_file.pl line 37.
b="programmer" a=b b=c d=a print b
b="programmer" a=b b=c d=a print troller