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# Regular expression processing
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import re
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def sub_recursive(sub_func, str_):
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    '''
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    @param sub_func(str_):str_, n
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    '''
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    while True:
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        str_, n = sub_func(str_)
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        if n == 0: break
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    return str_
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def sub_nested(re_, repl, str_):
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    return sub_recursive(lambda s: re.subn(re_, repl, s), str_)
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