On Mar 3, 2012, at 4:15 PM, R wrote: > I'm using NSRegularExpression to build an array of all NSRanges in the > text field that start with "http". I then use NSScanner to scan until > it finds whitespace or end of line characters for each > range.location. I then place this new subString into a NSURL to > validate that it does not return nil.
Um, why not use NSRegularExpression to find the whole thing? /http://\S+/ Actually if you search around you can probably find some better regexps for matching URLs. Requiring whitespace at the end is sort of fragile; people often put URLs in sentences with a comma or period afterwards. Also, URLs don’t have to start with “http”. There are FTP URLs, mailto: URLs and more. And it’s pretty common to omit the “http:” part and write the URL like www.apple.com, which most parsers will recognize. > I'm finding that NSURL pretty much likes everything..... > http://www.cnn.thePiratesWillWinTheWorldSeries is happy. Unfortunately that is a syntactically valid URL with a syntactically valid domain name. There just doesn’t happen to be a top-level-domain [yet] named “thePiratesWillWinTheWorldSeries”, but for all you know, next week somebody could buy that TLD and register the domain. It’s also possible that one could be in a network environment in which DNS is set to have a default domain like “corp.example.com” (pretty common in an intranet), in which case that hostname could resolve to “www.cnn.thePiratesWillWinTheWorldSeries.corp.example.com”. Again, unlikely but possible. Realistically, whatever message you found that URL in is messed up. Don’t even try to untangle that. > Is there a good way to validate a NSURL for the internet, short of > pinging? Look up the hostname. No ping required. > My next step is to find the end of the substring, count back three > characters and check for com,edu or org... seems clunky and inaccurate > for future internet standards. It’s a lot more than those three! There are already something like 200 other top-level domains (including one for every country on Earth), and as I said above, ICANN is about to start selling off new ones to people willing to pay a lot of money. Honestly, use Data Detectors. —Jens
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