On 7 October 2014 17:15,  <jonathan.slend...@gmail.com> wrote:
> Probably I'm turning the use of regular expressions upside down with this 
> question. I don't want to write a regex that matches prefixes of other 
> strings, I know how to do that. I want to generate a regex -- given another 
> regex --, that matches all possible strings that are a prefix of a string 
> that matches the given regex.
> [...]
> Logically, I'd think it should be possible by running the input string 
> against the state machine that the given regex describes, and if at some 
> point all the input characters are consumed, it's a match. (We don't have to 
> run the regex until the end.) But I cannot find any library that does it...

How wide a net are you counting "regular expressions" to be? What
grammar are you using?
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