提取两个字符之间的数字

import re

def extract_numbers_between_chars(string, char1, char2):
    pattern = f"{char1}(\d+){char2}"
    match = re.search(pattern, string)
    if match:
        return match.group(1)
    else:
        return None

# 示例用法
string = "abc123def456ghi"
char1 = "c"
char2 = "d"
result = extract_numbers_between_chars(string, char1, char2)
print(result)  # 输出：123