[RSS Feed/News] Convert PHPBB (Old) design codes that blend into the text

[XenForo]

I imported the forum, and there are old style codes in the posts that blend into the body of the text. So:

Code:

[align=justify][font=Calibri,sans-serif][font=Arial,sans-serif]abcd efg.[/font][/font][/align]
How should you clean it?

Thanks.

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