Problem with the regex for the first Huricane (AL)

Hello, the Key value and other tags from the first row of data is not read by the get_hurdat function (for the Atlantic Huricane data set).

I think using the next line should be OK to have this done : 
"grep(pattern = "^[[:space:]*[:alpha:]{2}[:digit:]{6}]|[[:digit:]]{8}", x = txt)" 

Thanks for your work on this library and in advance for the update.