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c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -e
"my @test = qw(RC1XY RS RW12QW1X FOO FOOx FOO23PQ xFOO23PQXXX foo xyzz
+y);
...
'xFOO23PQXXX' -> ("FOO", 23, "P", "Q")
'foo' -> no match
'xyzzy' -> no match