Select members of a list that match given regex pattern
list.match(.data, pattern, ...)
A list or vector
character. The regex pattern to match the name of the members
Additional parameters to pass to grep
x <- list(p1 = list(type='A',score=list(c1=10,c2=8)),
p2 = list(type='B',score=list(c1=9,c2=9)),
p3 = list(type='B',score=list(c1=9,c2=7)))
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