How can I apply regular expression to filter a string

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How can I apply regular expression to filter only\[code\][video src="http://duel.evotechaustin.com/wp-content/uploads/2010/09/kramer.m4v" width="480" height="360" id="b-test" class="player" ] \[/code\]from the following string\[code\]Is simply dummy text of the printing and typesetting industry. [video src="http://duel.evotechaustin.com/wp-content/uploads/2010/09/kramer.m4v" width="480" height="360" id="b-test" class="player" ]Lorem Ipsum has been the industry's standard dummy text ever since the 1500s.\[/code\]or Without using regular expression and Dom is there anyways to get the same