As Mr. Alex Rousskov suggested, the problem was the regex itself. He provided me a modified regex (more simple) and now the filter is working.
My regex: ((?=.*\biphone\b)|(?=.*\bprod\b)).*\.facebook\.com(\:|\d|)
Alex's regex: \b(iphone|prod)\b.*\.facebook\.com
Using https://regex101.com/ both work, but squid only accepts the second one. After running squid3 -k parse I got no errors. Thanks Alex.
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