r - Parse time elapsed / time span / duration with several different formats -

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i need parse time spans several different formats, including days, hours, minutes, seconds.ms, separated :: %os, %h:%os, %h:%m:%os or %d:%h:%m:%os. example:

x <- c("28.6575", "1:14.0920", "1:5:38.1230", "5:23:59:38.7211")

the first idea comes mind using strptime parse given strings date. approach not work strings not contain parts of time span. possible turn parts of format string being optional? 

strptime("5:23:59:38.7211", "%d:%h:%m:%os") # [1] "2015-08-05 23:59:38" strptime("1:5:38.1230", "%d:%h:%m:%os") # [1] na # wanted: "2015-08-01 01:05:38"

a different approach turn formatted values seconds (e.g. 1:14.0920 ~~> 74.0920 secs). however, unable find convenient way using r.

here's expanded version of @konrad rudolph's comment:

# split time spans different time elements l <- strsplit(x, ":")  # pad vector leading zeros. here 4 maximum number of time elements m <- sapply(l, function(x) as.numeric(c(rep(0, 4 - length(x)), x)))  # convert result desired unit, e.g. seconds m[1 , ] * 24*60*60 + m[2 , ] * 60*60 + m[3 , ] * 60 + m[4 , ] # [1]     28.6575     74.0920   3938.1230 518378.7211

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