擅长:python、mysql、java
<p>试试这个:</p>
<pre><code>\\{2,}
</code></pre>
<p>替换为:</p>
<pre><code>\\
</code></pre>
<p><a href="https://regex101.com/r/OT2IjN/1" rel="nofollow noreferrer">Demo</a></p>
<p>示例代码:</p>
<pre><code>import re
regex = r"\\{2,}"
test_str = r"%Software\\Policies\\\\Microsoft\\Windows\\Safer\\CodeIdentifiers\\0\\Hashes\\"
subst = r"\\"
result = re.sub(regex, subst, test_str, 0)
if result:
print (result)
</code></pre>
<p><a href="http://ideone.com/V3RP7h" rel="nofollow noreferrer">Run it</a></p>