r split on delimiter not in parentheses

Question

I am currently trying to split a string on the pipe delimiter: 

999|150|222|(123|145)|456|12,260|(10|10000)

The catch is I don\'t want to s

Answer 1

This seems to work

x <- '999|150|222|(123|145)|456|12,260|(10|10000)'
m <- strsplit(x, '\\|(?=[^)]+(\\||$))', perl=T)

# [[1]]
# [1] "999"        "150"        "222"        "(123|145)"  "456"        "12,260"    
# [7] "(10|10000)"

Here we not just split on the | but we also use a look ahead to make sure that there are no ")" marks before the next | or the end of the string. Note that this method doesn't require or ensure the parenthesis are balanced and closed. We assume your input is well formatted.