How select data within brackets in pandas data frame

Question

I have a pandas data frame. The column of my data frame that I am interested contains strings. Within the string there is a section that has brackets. It looks like so:

Some Data (More Info)
Some Data (More Info)
Some Data (More Info)

What I am trying to do is select the data that’s in between the brackets and stick it into a new column. I was been playing around with split but I cant get it to work because I am left with an extra ‘)’ at the end of the string. Is there away to select the data with out having the brackets without have this little bracket left over? I don't think I can split by just spaces alone because my some data has spaces in it.

I am splitting the data by:

df_split = df_abc['title'].str.split('(', expand=True)

Answer 1

Use str.extract:

res = df_abc['title'].str.extract(r'\((.*?)\)')
print(res)

Output

           0
0  More Info
1  More Info
2  More Info

As an alternative use a named capturing group, to obtain a column name:

res = df_abc['title'].str.extract(r'\((?P<text>.*?)\)')
print(res)

Output

        text
0  More Info
1  More Info
2  More Info

It also may be worth to take a look str.extractall for multiple occurrences of the pattern.