R的正则表达式

Question

> name = '645te5.78d'

I am looking for a function that can get rid of the dot and anything that follows in my variable name .

> new_fun(name)
> name
'645te5'

Answer 1

sub应该工作：

sub('\\..*', '', name)

Answer 2

If that is a general case that

There exist only one dot and you want to get the first part. Maybe you strsplit instead.

unlist(strsplit(name, '\\.'))[1]