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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: InetAddressUtils - use of non-capturing groups
Date Mon, 11 Feb 2013 13:05:11 GMT
On Mon, 2013-02-11 at 12:24 +0000, sebb wrote:
> The IPv6 regexes use non-capturing groups - i.e. (?:pattern) - whereas
> the IPV4 pattern uses capturing groups - i.e. (pattern).
> 
> Just wondering why they don't all use non-capturing groups, given that
> the patterns are only used in boolean matches() methods?
> 

No reason. Just me being sloppy.

> If it more efficient to use non-capturing groups, perhaps they should
> be use throughout?
> 
> If efficiency is not a concern, then the IPv6 patterns would be easier
> to read if they used non-capturing groups, as that would mean the
> colon would only appear as itself rather than sometimes as itself and
> sometimes as part of (?:pattern). In some cases the pattern begins
> with : which looks odd.
> 

I think we should strive for simplicity over efficiency here. These
regular expressions are already too complex for mere mortals. Anything
that would make them more readable would be a good thing.

Oleg  



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