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  1. or download this
    '  tom  harry  ' =~ m/(?<=tom).*(dick|harry|john)/ && print(1, $/);  #
+ 1
'  harry  tom  ' =~ m/(?<=tom).*(dick|harry|john)/ && print(2, $/);  #
+ (nothing)
  2. or download this
    '  tom  harry  ' =~ m/(?=.*tom).*(dick|harry|john)/ && print('A', $/);
+  # A
'  harry  tom  ' =~ m/(?=.*tom).*(dick|harry|john)/ && print('B', $/);
+  # B