You did the same thing I did I imagine. The regexcrossword.com link has a small mistake: [^PZVJG]{4}(.)[EFUG]{6}(.)[^\sPZVJI]{2} should be [^PZVJG]{4}(.)[EFU

You did the same thing I did I imagine. The regexcrossword.com link has a small mistake: [^PZVJG]{4}(.)[EFUG]{6}(.)[^\sPZVJI]{2} should be [^PZVJG]{4}(.)[EFUG]{6}\1[^\sPZVJI]{2} (note the \1 )