<p>我正在python中使用re模块,我一直想替换的是只指定出现的字符串。
<strong>例如</strong></p>
<pre class="lang-py prettyprint-override"><code>import re
string = "aabbaabbaabbabbaabbaa"
#I want to replace only 3rd time 'bb' appeared in the string with white space
string = re.sub("bb"," ",string,3) #if iI do this all first 3 occurrences got replaced
print(string)
</code></pre>
<p><strong>输出</strong></p>
<pre><code>aa aa aa aabbaabbaa
</code></pre>
<p>知道如何只替换第三次出现的内容吗<br/>
因此,输出看起来像<strong>这个<strong></p>
<pre><code>aabbaabbaa aabbaabbaa
</code></pre>