获取大文件中以'>‘开头的行的下一行中两个模式之间的字符数

import re

def get_character_count(file_path, pattern1, pattern2):
    count = 0
    with open(file_path, 'r') as file:
        lines = file.readlines()
        for i in range(len(lines)):
            if lines[i].startswith('>'):
                next_line = lines[i+1]
                match = re.search(pattern1 + "(.*?)" + pattern2, next_line)
                if match:
                    count += len(match.group(1))
    return count

# 示例调用
file_path = 'path/to/your/file.txt'
pattern1 = 'pattern1'
pattern2 = 'pattern2'
character_count = get_character_count(file_path, pattern1, pattern2)
print("字符数：", character_count)