[Python] Nested Regex in Python [closed]

Markup:

<p><b>CHAPTER 1</b><p>TEST HELLO</p><p>TEST</p>
<p><b>SUBCHAPTER A</b><p>TEST</p><p>TESTEE</p>


<p><b>CHAPTER 20</b><p>W3SCHOOL</p><p><b>SUBCHAPTER B</b><p>HELLO</p>


Output:

<p CLASS="C1">CHAPTER 1. TEST HELLO TEST</p>
<p CLASS="C1">SUBCHAPTER A. TEST TESTEE</p>

p CLASS="C1">CHAPTER 20. W3SCHOOL</p>
<p CLASS="C1">SUBCHAPTER B. HELLO</p>


Using re.sub module

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