如何在python中根据文本而不是字母数字对字符串进行切片？

import re

def slice_string_by_text(text, pattern):
    matches = re.finditer(pattern, text)
    indices = [match.start() for match in matches]
    slices = [text[indices[i]:indices[i+1]] for i in range(len(indices)-1)]
    return slices

text = "Hello, World! This is a sample text. It contains some sample sentences."
pattern = r"\b(sample)\b"
slices = slice_string_by_text(text, pattern)
print(slices)