如何只删除字符串末尾的数字？

import re

def remove_trailing_digits(string):
    pattern = r'\d+$'
    return re.sub(pattern, '', string)

# 示例用法
string = 'abc123'
result = remove_trailing_digits(string)
print(result)  # 输出：abc

def remove_trailing_digits(string):
    index = len(string) - 1
    while index >= 0 and string[index].isdigit():
        index -= 1
    return string[:index+1]

# 示例用法
string = 'abc123'
result = remove_trailing_digits(string)
print(result)  # 输出：abc