怎么去掉词尾的数字？

Question

I want to remove numbers from a string which is just placed after a word without any space. eg:

'Senku Ishigami is charecter from a manga series98 onging since 2017.'

should be:

'Senku Ishigami is charecter from a manga series onging since 2017.'

I could remove detect the numbers with a regex '[az]+[0-9]+' , But when I can't understand how can I remove it. I tried to remove it by just writing '[az]' , as I thought it would work, but it is just printing '[az]' as a string .

Here is the code:

import re

text ='Senku Ishigami is charecter from a manga series98 onging since 2017.'
text = re.sub(r'[a-z]+[0-9]+', '[a-z]', text)
print(text)

output:

Senku Ishigami is charecter from a manga [a-z] onging since 2017.

Answer 1

You might also use a capturing group capturing only a single char before matching 1+ digits.

In the replacement using group 1 using \\1

([a-z])\d+\b

regex demo

import re

text ='Senku Ishigami is charecter from a manga series98 onging since 2017.'
text = re.sub(r'([a-z])\d+\b', r'\1', text)
print(text)

Output

Senku Ishigami is charecter from a manga series onging since 2017.

Answer 2

You can use

import re

text ='Senku Ishigami is charecter from a manga series98 onging since 2017.'
text = re.sub(r'(?<=[a-z])\d+\b', '', text)
print(text) # => Senku Ishigami is charecter from a manga series onging since 2017.

See the regex demo and a Python demo .

Regex details

• (?<=[az]) - a location immediately preceded with a lowercase ASCII letter
• \\d+ - one or more digits
• \\b - word boundary (the digits will only be matched at the end of a word).