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Most of the <a target="_blank" rel="noopener noreferrer nofollow" class="reference internal" href="https://docs.python.org/3/reference/lexical_analysis.html#escape-sequences">escape sequences</a> supported by Python string literals are also accepted by the regular expression parser:<pre class="hljs"><code>\a \b \f \n
\N \r \t \u
\U \v \x \\
</code></pre>(Note that <code>\b</code> is used to represent word boundaries, and means “backspace” only inside character classes.) <a target="_blank" rel="noopener noreferrer nofollow" href="https://docs.python.org/3/library/re.html">https://docs.python.org/3/library/re.html</a> 위는 python 공식 사이트 library 에서 발췌했구요, backspace 를 뜻하는\b는 캐릭터 사이에 있을 때에만 되는게 맞는 것 같네요.

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