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POHow to write regular expressions in Objective C (NSRegularExpression)?
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  1. POHow to write regular expressions in Objective C (NSRegularExpression)?
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    copied!<p>I have this regex working when I test it in PHP but it doesn't work in Objective C:</p> <pre><code>(?:www\.)?((?!-)[a-zA-Z0-9-]{2,63}(?&lt;!-))\.?((?:[a-zA-Z0-9]{2,})?(?:\.[a-zA-Z0-9]{2,})?) </code></pre> <p>I tried escaping the escape characters but that doesn't help either. Should I escape any other character?</p> <p>This is my code in Objective C:</p> <pre><code>NSMutableString *searchedString = [NSMutableString stringWithString:@"domain-name.tld.tld2"]; NSError* error = nil; NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(?:www\\.)?((?!-)[a-zA-Z0-9-]{2,63}(?&lt;!-))\\.?((?:[a-zA-Z0-9]{2,})?(?:\\.[a-zA-Z0-9]{2,})?)" options:0 error:&amp;error]; NSArray* matches = [regex matchesInString:searchedString options:0 range:NSMakeRange(0, [searchedString length])]; for ( NSTextCheckingResult* match in matches ) { NSString* matchText = [searchedString substringWithRange:[match range]]; NSLog(@"match: %@", matchText); } </code></pre> <p>-- UPDATE --</p> <p>This regex returns (in PHP) the array with values "domain-name" and "tld.tld2" but in Objective C i get only one value: "domain-name.tld.tld2"</p> <p>-- UPDATE 2 --</p> <p>This regex extracts 'domain name' and 'TLD' from the string:</p> <ul> <li>domain.com = (domain, com)</li> <li>domain.co.uk = (domain, co.uk)</li> <li>-test-domain.co.u = (test-domain, co)</li> <li>-test-domain.co.uk- = (test-domain, co.uk)</li> <li>-test-domain.co.u-k = (test-domain, co)</li> <li>-test-domain.co-m = (test-domain)</li> <li>-test-domain-.co.uk = (test-domain)</li> </ul> <p>it takes the valid domain name (not starting or ending with '-' and between 2 and 63 characters long), and up to two parts of a TLD if the parts are valid (at least two characters long containing only letters and numbers)</p> <p>Hope this explanation helps.</p>
 

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