I've tried all kinds of solutions for this - including WPMU's Global Search Plugin (a mistake).
This plugin really does work. There are a few kinks, as some have intimated (shortcodes / html, etc.) show up in search results.
Additionally, I cannot get excerpts to work for the life of me, so I just changed the following on /inc/shortcodes/php, lines 271-274:
if(strcmp($excerpt, "yes") == 0)<br /> echo ms_global_search_get_the_excerpt( $s );<br /> else<br /> echo ms_global_search_get_the_content( $s ); ?>
And replaced the_content with the_excerpt on line 274, thus forcing the excerpts. I'm happy with the results!
But I can live with that; it actually does search all blogs -- in my case, subdomains.
Other than that, it just takes knowledge of coding to work out the kinks.
I hope the author takes pride in this plugin and continues development!
Works perfectly. I modified some of the css to fit my theme. I would give five stars if the plugin included the ability to exclude specific posts and pages. Overall a very useful product that fills a much needed gap in WP Multisite functionality.
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