/((.*\.c\s)|(.*\.h\s)|(.*\.cpp\s))|(\s+(.*)\%\s+(of+)\s+\d+\s)|(\bNone\b)/g
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Capture group numbering begins at 1, not 0, so the capture group variables corresponding to the capturing groups in the example would be $1 .. $8. In the @- and @+ arrays, the offsets of the entire match are held at index 0. Otherwise, $0 holds the script name. See Variables related to regular expressions and perlvar in general.
Update: The [originally posted] question was for a match in list context ... which returns the matches as a list into an array. Quite right; my mistake.
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