如何从下面的代码中选择特定的文本？

text = "This is a sample text. Select specific text from this string."
keyword = "specific"

start_index = text.find(keyword)
end_index = start_index + len(keyword)

selected_text = text[start_index:end_index]
print(selected_text)

specific

import re

text = "This is a sample text. Select specific text from this string."
pattern = r"specific"

selected_text = re.search(pattern, text).group()
print(selected_text)

specific