如何在 Python 中使用正则表达式提取三个字母后跟五个数字

Question

I have the following dataframe in Python:

abc12345

abc1234

abc1324.

How do I extract only the ones that have three letters followed by five digits?

The desired result would be:

abc12345.

df.column.str.extract('[^0-9](\d\d\d\d\d)$')

I think this works, but is there any better way to modify (\d\d\d\d\d)? What if I had like 30 digits. Then I'll have to type \d 30 times, which is inefficient.

Answer 1

You should be able to use:

'[a-zA-Z]{3}\d{5}'

If the strings don't include capital letters this can reduce to:

'[a-z]{3}\d{5}'

Change the values in the {x} to adjust the number of chars to capture.

Answer 2

Or like this following code:

' import re

s = "abc12345"

p = re.compile(r"\d{5}")

c = p.match(s,3)

print(c.group()) '