There wasn't any question. Assuming the question was: "Which module do I use to implement checking for overlaps in number ranges/intervals", then the answer is: "Probably one of …"

• http://bioperl.org
• Array::IntSpan
• Data::Range::Compare
• Data::Range::Compare::Stream
• DynGig::Range::Integer
• Math::MPFI
• Number::Interval
• Number::Range
• Range::Object::Serial
• Set::IntervalTree
• Set::IntSpan
• Set::IntSpan::Fast
• Set::IntSpan::Fast::XS