From: Andy Elvey <andy.elvey@...>
Date: 2009-03-24T14:33:18+09:00
Subject: Re: Defining a "followed by" operator or function in Ruby

Brian Candler wrote:
>> Something like this -
>> "foo".(0,+) "bar" would match zero or more occurrences of "foo" followed
>> by "bar". So, it would match "foo" , "foo" "bar", "foo" "bar" "bar" ...
>> and so on.
>> 
>> "foo".(0,1) "bar" would match zero or one occurrences of "foo" followed
>> by "bar".
> 
> Are you talking about regular expression syntax?
> 
>   (foo){0,}(bar){1,}         # or (foo)?(bar)+
>   (foo){0,1}bar              # or (foo)?bar
> 
> See http://www.ruby-doc.org/docs/ProgrammingRuby/html/language.html#UL
> 
> Otherwise, if you are writing a parser for some language of your own 
> devising, then you are free to implement whatever syntax you wish. Buy a 
> good book on language and compiler design.
Hi Brian -
 Thanks very much for that - it should be a big help!
Bye for now -
 - Andy
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