dataframe - Grep in R (zero or any character) -


i have files lot of data, in several of them date in format: yyyymmdd, f. e. 20150704

and in others date in format: yyyy-mm-dd, f. e. 2015-07-04

i want grep find specific date, can 1 grep both examples?

i tried this:

grep("*07*04",file)

and this

grep(".07.04",file)

second form worked format yyyy-mm-dd not yyyymmdd

is there way 1 grep?

try

grep('-?07-?04$', str1)

data

 str1 <- c('2015-07-04', '20150704', '2014-08-07', '20150407',           '2015-07-14', '2015-01-04')

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