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To extract information from text with combination of capture groups in the form of subgroups, you use inner capture groups.
Regex: ([A-Za-z]+ (\d+))
This searches for a line with one or more alphabetic characters followed by a space and one or more numbers. The outer capture group captures the month and year with year in a capture subgroup.
Jan 1987 -- captures 'Jan 1987' and '1987'
May 1969 -- captures 'May 1969' and '1969'
Aug 2011 -- captures 'Aug 2011' and '2011'