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                Python中字符串前面加上 r 表示原生字符串, 與大多數編程語言相同,正則表達式里使用"\"作為轉義字符,這就可能造成反斜杠困擾。假如你需要匹配文本中的字符"\",那么使用編程語言表示的正則表達式里將需要4個反斜杠"\\":前兩個和后兩個分別用于在編程語言里轉義成反斜杠,轉換成兩個反斜杠后再在正則表達式里轉義成一個反斜杠。 Python里的原生字符串很好地解決了這個問題,有了原始字符串,你再也不用擔心是不是漏寫了反斜杠,寫出來的表達式也更直觀。 ~~~ >>> ret = re.match(r"c:\\a",mm).group() >>> print(ret) c:\a ~~~
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