[no subject]

-- CHS


-----Forwarded Message-----

> From: Charles Shapiro <charles.shapiro at nubridges.com>
> To: jeffrey.b.layton at lmco.com, ale at ale.org
> Subject: Re: [ale] OT: Lex pattern expression struggles
> Date: 26 Oct 2004 15:41:51 -0400
> 
> Um, I thought (f)lex used regex.
> 
> So it'd be something like
> 
> [:alnum:]{1,8} * (PARAM)|(TABLE)|(UPDATE)  { return TOKEN_BLAH; }
> 
> Or you could just use make your token returner into a subroutine and
> call it from three separate flex triggers, as:
> 
> FIRSTPART [:alnum:]{1,8} *
> 
> {FIRSTPART}PARAM { return_mytok() }
> {FIRSTPART}TABLE { return_mytok() }
> {FIRSTPART}UPDATE { return_mytok() }
> %%
> int return_mytok()
> {
> 	return TOKEN_BLAH;
> }
> 
> Flex and bison are Way Cool. I did a project in 'em oncet just to play
&gt; with them. See <a  rel="nofollow" href="http://tomshiro.org/coldread/";>http://tomshiro.org/coldread/</a>
&gt; 
&gt; --CHS
&gt; 
&gt; 
&gt; On Tue, 2004-10-26 at 14:53, Jeff Layton wrote:
&gt; &gt; Howdy!
&gt; &gt; 
&gt; &gt;    I'm struggling with a pattern expression for lex. I'm looking
&gt; &gt; for an expression that handle an alphanumeric string of 1 to
&gt; &gt; 8 characters (only letters and numbers) followed by at least
&gt; &gt; one space and one of three keywords: &quot;PARAM&quot; &quot;TABLE&quot;
&gt; &gt; or &quot;UPDATE&quot;. I've tried several things with no success (I
&gt; &gt; won't post them due to embarassment). Anyone have any
&gt; &gt; suggestions?
&gt; &gt; 
&gt; &gt; Thanks!
&gt; &gt; 
&gt; &gt; Jeff


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