有没有一种简单的方法可以用Python3用特定的十六进制值替换像XML一样的标签？

import re

def replace_hexadecimal(xml_string, tag_name, hex_value):
    pattern = r"<{}>.*?</{}>".format(tag_name, tag_name)
    replacement = "<{}>{}</{}>".format(tag_name, hex_value, tag_name)
    result = re.sub(pattern, replacement, xml_string)
    return result

# 示例用法
xml_string = "<root><color>#FFFFFF</color><size>12</size></root>"
tag_name = "color"
hex_value = "#000000"
new_xml_string = replace_hexadecimal(xml_string, tag_name, hex_value)
print(new_xml_string)