> On Mar 2, 2015, at 4:52 PM, Keary Suska <cocoa-...@esoteritech.com> wrote:
>
> That depends on what you mean by "validate." If you simply mean checking
> whether it well-formed, you can do that easily with a regular expression
> match, such as (written in email):
> ^http://(?:[a-z0-9-]+\.){1,}[a-z]{2,4}
It’s really much better to ask the system frameworks to do this kind of
checking/parsing, since they are more likely than you are to know all the
nuances of the RFCs. For instance, your regex above won’t work with
international domain names, or capitalized forms of domain names, or top-level
domains longer than 4 characters, or single-component domains like “foo”...
(I’m not saying this to pick on you, just warning people who might come across
this thread in a web-search and copy and paste your regex. I’m sure it would
also take me a while to write a regex that could reliably match domain names,
assuming I even decided to try; that’s part of my point.)
—Jens
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