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$string =~ /((\w|'|-)+)/g

$string =~ /([-\w']+)/g

$string =~ /(\w+[-']?\w+)/g

$string =~ /(\w+[-']?\w+|\w)/g

#!/usr/local/bin/perl

...
This is a sentence with words that're different from other words.  
They have apostrophes in them (') and dashes, or dash-like characters
(-).