我怎样才能阻止这个正则表达式变得贪婪呢？

import re

text = "This is a sample text."

# 贪婪匹配
greedy_pattern = r"(.+)"
greedy_match = re.search(greedy_pattern, text)
print(greedy_match.group(1))  # 输出：This is a sample text.

# 非贪婪匹配
non_greedy_pattern = r"(.+?)"
non_greedy_match = re.search(non_greedy_pattern, text)
print(non_greedy_match.group(1))  # 输出：T