Question: I want to create an image from nvidia jetson tx2, in several places (like <https://developer.ridgerun.com/wiki/index.php?title=Cloning_TX2>) talk about **flash.sh** file to perform the task but I cannot found it, also I search using `find / -iname flash.sh`  and nothing. Where can I find this file? Do I need install something eles?

Ubuntu 18.04.5 LTS, Jetpack 4.5.1

Answer: 
You can do this:

```
>>> df.TEST.str.extract("(1#[a-zA-Z]*)")
           0
0   1#London
1  1#England
2      1#USA
3        NaN
4        NaN
5    1#China

```
You can try:

```
# capture all characters that are neither `#` nor digits
# following 1#
df['TEST'].str.extract('(1#[^#\d]+)', expand=False)

```

Output:

```
0     1#London
1    1#England
2        1#USA
3          NaN
4          NaN
5      1#China
Name: TEST, dtype: object

```