XF 1.5 Regex for 'qoute' replacement HELP

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Hi

I was migrating ubbthreads -> xenforo, But I used vbulletin impex as a bridge since there is no direct converter from ubb -> xenforo.

Its done however need to convert bbcodes. Here is the bbcode qoute for ubb:

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MissCassie</div><div class="ubbcode-body"> TEXT HERE TEXT HERE</div></div>

I want to convert it to xenforo like this

TEXT HERE TEXT HERE

Im not expert in regex however I also doing a reseach for the fix on this.

Thanks