23 lines
756 B
Python
23 lines
756 B
Python
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import re
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if __name__ == "__main__":
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text = "yeah, but no, but yeah, but no, but yeah"
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# 简单的替换可以使用replace函数来完成
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text_change = text.replace('yeah', 'yep')
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print(text_change)
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# 对复杂的替换，我们可以使用re.sub模块
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text = "Today is 11/27/2012. PyCon starts 3/12/2013"
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text_change = re.sub(r'(\d+)/(\d+)/(\d+)', r'\3-\1-\2', text)
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print(text_change)
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# 如果需要多次替换，记得先编译再sub
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datepat = re.compile(r'(\d+)/(\d+)/(\d+)')
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print(datepat.sub(r'\3-\1-\2', text))
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# 想要知道完成了几次替换，可以使用subn
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# subn返回一个元组，结构为（替换后的字符串， 替换次数）
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print(datepat.subn(r'\3-\1-\2', text))
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