Suppose I have a character vector as follows:
> aa
[1] "1 (472)" "2 (445)" "3 (431)" "3 (431)" "5 (415)" "6 (405)" "7 (1)
I want to extract the values within parentheses and place them into a column
that is numeric. The values in aa vary in length and so using strsplit() wont
work because the positions change. Is there are better pattern matching
function that I can use to grab values from within the parentheses?
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