如何通过Python在字符串中找到最后一个目标字符串？

Question

We all know how to find the first targeted string in a string.

string.index('abc')

So this code will help me to find the first place that 'abc' appears in string.

However, I want to know how to find the last 'abc' location.

I already figured out an algorithm, but it is stupid.

1. reverse whole string and 'abc'.
2. temp_Location = string.index('cba')
3. exactly_Location = len(string) - temp_Location - len('cba')

I know it is really silly... Can somebody tell me how to do it smart?

Thanks a lot. :)

Answer 1

Use str.rindex

s = 'abcabc'
s.rindex('abc')  # evaluates to 3

Answer 2

You can also use the Python regex library , which will provide more functionality if needed.

In your case, you could simply do:

import re
s = 'abcabc'
[i.start() for i in re.finditer('abc', s)][-1] #last index from all match indices