如何只删除文本中的最后一个数字

import re

def remove_last_digit(text):
    pattern = r'\d(?!\d*$)'
    result = re.sub(pattern, '', text)
    return result

text = "Hello123"
result = remove_last_digit(text)
print(result)  # 输出 "Hello"

def remove_last_digit_from_file(file_path):
    with open(file_path, 'r') as file:
        lines = file.readlines()
    
    with open(file_path, 'w') as file:
        for line in lines:
            line_without_last_digit = line.rstrip()[:-1]  # 删除最后一个数字
            file.write(line_without_last_digit + '\n')

file_path = "example.txt"
remove_last_digit_from_file(file_path)