For example I have a time range below:

```
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

```

And what I want is to get the numbers from 13 to 20 only using grep -E '[1-2][??]'
is it possible?

please dont give answer about awk I'm not asking about it thank you very much