在 Pandas Dataframe 中提取字符串中两个字符之间的子字符串

Question

I have a column containing strings that are comprised of different words but always have a similar structure structure. Eg:

2cm off ORDER AGAIN (191 1141)

I want to extract the sub-string that starts after the second space and ends at the space before the opening bracket/parenthesis. So in this example I want to extract ORDER AGAIN.

Is this possible?

Answer 1

You can try the following:

r"2cm off ORDER AGAIN (191 1141)".split(r"(")[0].split(" ", maxsplit=2)[-1].strip()
#Out[3]: 'ORDER AGAIN'

Answer 2

You could use str.extract here:

df["out"] = df["col"].str.extract(r'^\w+ \w+ (.*?)(?: \(|$)')

Note that this answer is robust even if the string doesn't have a (...) term at the end.

Here is a demo showing that the regex logic is working.

Answer 3

If the pattern of data is similar to what you have posted then I think the below code snippet should work for you:

import re
data = "2cm off ORDER AGAIN (191 1141)"

extr = re.match(r".*?\s.*?\s(.*)\s\(.*", data)       
if extr:
    print (extr.group(1))

Answer 4

You can try the following code

s = '2cm off ORDER AGAIN (191 1141)'
second_space = s.find(' ', s.find(' ') + 1)
openparenthesis = s.find('(')
substring = s[second_space : openparenthesis]
print(substring) #ORDER AGAIN