Everything on this page is optional.
The Lines to Omit Page of the New/Edit Ruleset Dialog lets you describe lines that should be completely omitted from the difference analysis. For example, lines containing RCS revision or date keywords.

	  The list box presents a list of the patterns already defined.
	  You may create as many of these patterns as you want.  You can think
	  of these as a series of grep -v commands applied to the
	  each file before DiffMerge compares them.
	

