I want to do gsub with lots of variations in spaces.

My text is

```
Yes, please periodically send me e-mail updates

```

I want to remove this sentence. But I have lots of variations of this in my corpus. For example, I have

```
Yes, please periodically send me e-mail  updates
Yes, please periodically send me  e-mail updates
Yes, please periodically  send me e-mail updates

```

How can I remove these sentences with regular expression? I tried to specify every case like a following code. 

```
gsub("Yes, please periodically send me  e-mail updates", "", text)        
gsub("Yes, please periodically send me e-mail  updates", "", text)        
gsub("Yes, please periodically  send me e-mail updates", "", text)        

```

I believe there is a better way to remove these sentences with one code. Thank you for any help!