[R] Replace split with regex for speed ?

[rivercode]

Have timestamp in format HH:MM:SS.MMM.UUU and need to remove the last "." so
it is in format HH:MM:SS.MMMUUU.

What is the fastest way to do this, since it has to be repeated on millions
of rows. Should I use regex ?

Currently doing it with a string split, which is slow:

 >head(ts)
[1]  09:30:00.000.245  09:30:00.000.256  09:30:00.000.633  09:30:00.001.309 
09:30:00.003.635  09:30:00.026.370


  ts = strsplit(ts, ".", fixed = TRUE)
  ts=lapply(ts, function(x) { paste(x[1], ".", x[2], x[3], sep="") } ) 	#
Remove last . from timestamp, from HH:MM:SS.MMM.UUU to HH:MM:SS.MMMUUU
  ts = unlist(ts)

Thanks,
Chris

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