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>perl -wMstrict -le
"$_ = 'abcdef';
...
            \A: pos = undef
          \A/g: pos = 0
 \A/g repeated: pos = undef

>perl -wMstrict -le
"$_ = 'abcdef';
...
   single \b/g: pos = 0
   double \b/g: pos = 6
   triple \b/g: pos = undef