Extract/Match string with "_" inbetween 2 words

I’m trying to extract any strings with a "_" in the middle.

For example, with name1_name2 _ nothing test1 _ test 2_ _3 I would like to extract name1_name2

Thank you for reading!

>Solution :

>>> import re
>>> s = 'name1_name2 _ nothing test1 _ test 2_ _3 name3_name4'
>>> re.findall('[a-zA-Z0-9]+_[a-zA-Z0-9]+', s)
['name1_name2', 'name3_name4']
>>> re.findall('\w+_\w+', s)
['name1_name2', 'name3_name4']