I need to strip all html tags from a string except <sub></sub> & <sup></sup> tags.
Suppose if a string is "<p>Hello world</p> <span class="required">H<sub>2</sub>O</span>"
Output should be Hello world H<sub>2</sub>O
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Rather than using regular expressions, you may find it easier to use something like Html Agility Pack which gives you a read/write DOM to play with.