在python中，如何根据字符串中的特定单词对行进行分组

import re

def group_rows_by_keyword(lines, keyword):
    groups = {}
    pattern = r'\b{}\b'.format(re.escape(keyword))
    for line in lines:
        match = re.search(pattern, line)
        if match:
            keyword = match.group(0)
            if keyword not in groups:
                groups[keyword] = []
            groups[keyword].append(line)
    return groups

# 示例用法
lines = ['apple', 'banana', 'orange', 'grape', 'apple pie', 'banana split']
keyword = 'apple'
result = group_rows_by_keyword(lines, keyword)
print(result)

{'apple': ['apple', 'apple pie']}