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flex: How do I abandon a file in the middle of a scan and switch to a new file?

 
 How do I abandon a file in the middle of a scan and switch to a new file?
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 Just call 'yyrestart(newfile)'.  Be sure to reset the start state if you
 want a "fresh start, since 'yyrestart' does NOT reset the start state
 back to 'INITIAL'.
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