How does the Beyond Compare diff algorithm work?
I'm curious to know how does the diff algorithm of 'Beyond Compare' work?
I guess there's a standard (well-known?) diff algorithm they used to implement the "character .vs. character" comparison. Do you know the name of this diff algorithm? Thank you
Beyond Compare uses a number of different algorithms depending on the file type and configuration. In v4 the line alignment algorithms are explicitly named in the interface:
Standard alignment - This is a proprietary algorithm; we haven't made the details publicly available.
Myers O(ND) alignment - This is the same one that the GNU
diffutility and most other applications use. It's based on the paper "An O(ND) difference algorithm and its variations" by Eugene Myers (1986).Patience Diff alignment - This is the "Patience Diff" algorithm that Bram Cohen originally developed for Bazaar, which he talks about here.
The character alignment to highlight differences within lines is based on the Myers O(ND) algorithm with some post-processing to clean up the results.
The alignment setting can be configured by clicking the Rules button 
which brings up this dialog, which you can then configure for session scope or with a persistent default against the file association.
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