>>> import re
>>> re.findall(r'\bf[a-z]*', 'which foot or hand fell fastest')
['foot', 'fell', 'fastest']
>>> re.sub(r'(\b[a-z]+) \1', r'\1', 'cat in the the hat')
'cat in the hat'
只需简单的操作时,字符串方法最好用,因为它们易读,又容易调试: >>> 'tea for too'.replace('too', 'two')
'tea for two'
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