/((.*\.c\s)|(.*\.h\s)|(.*\.cpp\s))|(\s+(.*)\%\s+(of+)\s+\d+\s)|(\bNone
+\b)/g
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each opening bracket starts a grouping. Groupings that don't match will be undef !

You can use extended regex (?:PATTERN) for clustering but not grouping to skip an index

update

... or even avoid (...) where you don't need any clustering at all (like in your or-branches).