XenForo regex help for Template Mod

[securedme]

How do I add the following BEFORE any lines containing 'thread.title' in a template (thread_list_macros)?

Less:

<xf:if is="!$forum">
    <a href="{{ link('forums', $thread.Forum) }}">{$thread.Forum.title}</a>
</xf:if>

Thank you.

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