From: Nikolai Weibull <mailing-lists.ruby-talk@...>
Date: 2005-06-29T00:09:01+09:00
Subject: Re: Ask for help about Regexp

Eric Luo wrote:

> I need to match my input dynamically by Regexp, For example: I want
> match to this regexp: mask = /\d{10}tt\d{0, 5} then I give my input
> byte by byte. And I want to be noticed at the first time when it is
> impossible for me to match my input to the regexp mask.  so if i input
> 34789d, when I the input the character 'd', I will be noticed.
> 
> I wonder if it's possible or not. if it is, how could I do that?

Well, you can’t easily do that.  You could write a regex that matches
valid prefixes of the strings of the language of the final regex, but
that can become quite complicated.  You should probably rethink your
algorithm,
        nikolai

-- 
Nikolai Weibull: now available free of charge at http://bitwi.se/!
Born in Chicago, IL USA; currently residing in Gothenburg, Sweden.
main(){printf(&linux["\021%six\012\0"],(linux)["have"]+"fun"-97);}