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some_string <- "1_2018_start_2007_3_end"
sub(".*?_(\\d{4})_.*", "\\1", some_string) # leftmost
sub(".*_(\\d{4})_.*", "\\1", some_string) # rightmost

Success #stdin #stdout 0.16s 175424KB

stdin

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Standard input is empty

stdout

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[1] "2018"
[1] "2007"

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language:

R (R 3.5.2)

created:

visibility:

public

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