Separating dates from text in R

I have a vector of strings that include a repeating pattern of start and end dates for variables collected at a site. Here is the first entry: "1942-10-06,1996-03-31Snow Depth (in/mm)1942-11-01,1996-03-31Snowfall (in/mm)1942-10-01,1997-12-27Growing...
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| date   | R   2017-08-15 23:08 (1) Answers