I might be wrong but I think your first method will give a false positive if one string contains a duplicated word but that word doesn't appear in the other string. The $counts{$_} will be more than one but only because the word appeared twice in the same string, not because it was duplicated in the other string.

Cheers,

JohnGG

In reply to Re^2: Finding common substrings by johngg
in thread Finding common substrings by ktsirig

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