RSS Feed/News Template modification with regex within condition

[ENXF NET]

Is it possible to find a element with regex within condition? Or any other approach to get that?

I need something like:
Code:

<xf:if is="condition == 1">
    #(<div [^>]*class="[^"]*first-class[^"]*"[^>]*>)#isU
<xf:else />
    #(<div [^>]*class="[^"]*another-class[^"]*"[^>]*>)#isU
</xf:if>

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