See threads like finding intermediate range values from two file columns, Calculate the overlap length between two ranges, find the coverage of sequence in a particular range, Match Numeric Range, and Range overlap (with a lot of ranges). In particular, Set::IntSpan will probably do exactly what you want.

Added two more links.

In reply to Re: comparing ranges of numbers between 2 files by haukex
in thread comparing ranges of numbers between 2 files by Anonymous Monk

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