... and if it's something you need to fix, you can do so easily by packing everything but the first character into a look-ahead: 
my $count =()= 'abrabrabrabra' =~ /b(?=rabra)/g;

[download]

Of course in this case you know that the first possible overlap starts at the second be, so even /bra(?=bra)/ works fine.

(I haven't benchmarked it, but I suppose that non-look-around literals are a bit faster, due to optimizations regarding the match length).

In reply to Re^3: Find number of short words in long word by moritz
in thread Find number of short words in long word by sedm1000

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