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Use of uninitialized value in regexp compilation at Program.pl line 15 +2, <FLAT_FILE_B> line 1.
while (<FLAT_FILE_B>){ ... if (defined $chosen_C && $chosen_C =~ /;(\d{1,3});\d{1,3};Stand_me +thod;'SMRxsxtxmx(\d\d\d\d)x(\d\d\d\d)x(\d\d)x(\d\d\d\d).{0,10}'/){ # + Here I get the warning message