问题
Used to run R with numbers and matrix, when it comes to play with strings and characters I am lost. I want to analyze some data where the time is read into R as follow:
>my.time.char[1]
[1] "\"2011-10-05 15:55:00\""
I want to end up with a string containing only:
"2011-10-05 15:55:00"
Using the function sub() (that i barely understand...), I got the following result:
> sub("(\")","",my.time.char[1])
[1] "2011-10-05 15:55:00\""
This is closer to the format i am looking for, but I still need to get rid of the two last characters (\").
回答1:
The second line from ?sub explains:
sub and gsub perform replacement of the first and all matches respectively.
which should tell you to use gsub instead.
来源：https://stackoverflow.com/questions/10560503/replacing-all-occurrences-of-a-pattern-in-a-string