An 800MB text file is way too large to process - I'm not even sure Word could open it. The published limit is 512MB with no more than 32MB of text. I suggest you use another app to filter the data to eliminate everything that doesn't match your US/RE pattern. You may even need to break those up into smaller chunks.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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