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      To: "Dmitriy Goldobin" <gold@ems.chel.su>
      Subject: Re: FLEX trouble
      In-reply-to: Your message of Mon, 31 May 1999 18:44:49 PDT.
      Date: Tue, 01 Jun 1999 00:15:07 PDT
      From: Vern Paxson <vern>
 
      >   I have a trouble with FLEX. Why rule "/*".*"*/" work properly,=20
      > but rule "/*"(.|\n)*"*/" don't work ?
 
      The second of these will have to scan the entire input stream (because
      "(.|\n)*" matches an arbitrary amount of any text) in order to see if
      it ends with "*/", terminating the comment.  That potentially will overflow
      the input buffer.
 
      >   More complex rule "/*"([^*]|(\*/[^/]))*"*/ give an error
      > 'unrecognized rule'.
 
      You can't use the '/' operator inside parentheses.  It's not clear
      what "(a/b)*" actually means.
 
      >   I now use workaround with state <comment>, but single-rule is
      > better, i think.
 
      Single-rule is nice but will always have the problem of either setting
      restrictions on comments (like not allowing multi-line comments) and/or
      running the risk of consuming the entire input stream, as noted above.
 
      		Vern

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