[How To?] how to add alt tag in bbcode for images

[POP]

Regular Expression:
Code:

\[img alt=(.*?)\](.*?)\[/img\]

HTML Replacement:
Code:

<img src="$2" alt="$1" title="$1" />

Usage:

[img alt=MyBB]http://community.mybb.com/images/logo.gif[/img]

But i want to remove "alt=MyBB" when post and make like general which we used to post image

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Bump........