[antlr-interest] Lexer rule for strings with quoted strings within

[Jim Idle]

1) Backtracking will not work in lexers
2) Don't advise people to use backtrack mode
3) That rule will give warnings anyway


BTW Guys, don't forget antlr.markmail.org !!!

Jim

> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Bart Kiers
> Sent: Thursday, March 25, 2010 6:51 AM
> To: Anders Sollander
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] Lexer rule for strings with quoted
> strings within
> 
> On Thu, Mar 25, 2010 at 2:01 PM, Anders Sollander <
> Anders.Sollander at mathworks.de> wrote:
> 
> > Hi,
> >
> > I've been trying to write a lexer rule for strings with strings in
> them,
> > like
> >
> >        "This has a ""quoted string"" within"
> >
> > Is there a simple lexer rule for this, or do I need some kind of look
> > ahead?
> >
> >
> You could enable the `backtrack` option:
> 
> String
> options { backtrack = true; }
>   :  '"' ('""' | ~'"')+ '"'
>   ;
> 
> Regards,
> 
> Bart.
> 
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