如何在pyparsing中为此编写语法:匹配一组单词但不包含给定模式

from pyparsing import *

# 定义不包含的模式
exclude_pattern = Literal("exclude")

# 定义要匹配的单词
word = Word(alphanums + "_")

# 使用SkipTo和FollowedBy来匹配一组单词但不包含给定模式
pattern = SkipTo(exclude_pattern) + FollowedBy(exclude_pattern)

# 测试
test_string = "this is a test string, exclude this"
result = pattern.parseString(test_string)
print(result[0])  # 输出：this is a test string,