测试子表达式是否包含非交换符号

import re

def test_subexpression(expression):
    pattern = r'[-/]'  # 匹配减法和除法符号
    match = re.search(pattern, expression)
    if match:
        return True
    else:
        return False

# 测试表达式是否包含非交换符号
expression = "2 + 3 * (4 - 1)"
result = test_subexpression(expression)
print(result)  # 输出：False

expression = "2 + 3 / (4 - 1)"
result = test_subexpression(expression)
print(result)  # 输出：True