搜索以字母开头的字符串，并将其第n列值替换为另一个文件值

import re

# 读取第一个文件内容
file1_data = []
with open('file1.txt', 'r') as file1:
    for line in file1:
        file1_data.append(line.strip().split(','))

# 读取第二个文件内容
file2_data = []
with open('file2.txt', 'r') as file2:
    for line in file2:
        file2_data.append(line.strip().split(','))

# 遍历第一个文件内容
for i in range(len(file1_data)):
    row = file1_data[i]
    for j in range(len(row)):
        # 判断是否以字母开头
        if re.match(r'^[a-zA-Z]', row[j]):
            # 确定需要替换的列数n
            n = j + 1
            # 获取第二个文件中对应的值
            replace_value = file2_data[i][n-1]
            # 替换第一个文件中的值
            file1_data[i][n-1] = replace_value

# 将修改后的内容写入新文件
with open('output.txt', 'w') as output_file:
    for row in file1_data:
        output_file.write(','.join(row) + '\n')