freebsd-ports/textproc/p5-String-LCSS/pkg-descr

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String::LCSS provides the function "lcss" to ferret out the longest common
substring shared by two strings passed as arguments. undef is returned if
the susbstring length is one char or less.
When used in an array context, lcss will returns the indexi of the match root
in the two args.
WWW: https://metacpan.org/release/String-LCSS