Filter out #(hash)tags of text

Extract `2017-11-30` and `this is also` from 
```
# Not this

I am experimenting with tags.

#2017-11-30 #"this is also"
```
with this [regular expression](http://rubular.com/): `#("(.*?)")|#(\S+)`, saving it as
```
# Not this

I am experimenting with tags.
```
Note that this gives multiple matching results.
