{"id":32405,"date":"2023-01-29T14:06:12","date_gmt":"2023-01-29T08:36:12","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-what-are-some-different-ways-of-making-an-effective-email-validation-method-without-using-regular-expression-in-objective-c\/"},"modified":"2023-01-29T14:06:12","modified_gmt":"2023-01-29T08:36:12","slug":"solved-what-are-some-different-ways-of-making-an-effective-email-validation-method-without-using-regular-expression-in-objective-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-what-are-some-different-ways-of-making-an-effective-email-validation-method-without-using-regular-expression-in-objective-c\/","title":{"rendered":"[Solved] What are some different ways of making an effective email validation method without using regular expression in objective c?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-21786291\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"21786291\" data-parentid=\"21785805\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>my attempt<\/p>\n<pre><code>@interface Tester : NSObject\n+(BOOL) testForValidMail:(NSString *)mail;\n@end\n\n@implementation Tester\n\n+(BOOL)testForValidMail:(NSString *)string\n{\n\n    NSRange atRange = [string rangeOfString:@\"@\"];\n\n    BOOL b = NO;\n\n    if ((atRange.location != NSNotFound) \/\/is `@` present\n        &amp;&amp; (atRange.location != 0) \/\/ and is `@` not at the beginning -&gt; left substring exist\n        &amp;&amp; (atRange.location != string.length-1) \/\/ and not at the end -&gt; right substring exists\n        &amp;&amp; ([[string componentsSeparatedByString:@\"@\"] count] == 2)) \/\/ and is there only one `@`?\n    {\n        \/\/ is there a `.` right of the `@`?\n        NSRange dotRange = [[string substringFromIndex:atRange.length +atRange.location] rangeOfString:@\".\"];\n\n        if((dotRange.location != NSNotFound) \/\/ is there a `.` right of `@`\n           &amp;&amp; (dotRange.location !=0) \/\/ and is it not the very next char after `@`\n           &amp;&amp; ([[string substringFromIndex:[string length]-2] rangeOfString:@\".\"].location == NSNotFound)) \/\/ and the `.` is not the last or second last char\n        {\n            b = YES;\n        }\n    }\n    return b;\n}\n\n@end\n\n\nint main(int argc, const char * argv[])\n{\n\n    @autoreleasepool {\n    NSArray *candidates = @[@\"m@m.de\",\n                            @\"m@.de\",\n                            @\"m@m.e\",\n                            @\"@m.de\",\n                            @\"m&lt;at&gt;m.de\",\n                            @\"mm@mm@mm.de\",\n                            @\"email@email.email.email.com\" \/\/if you are the owner of email.com, you can decide to create this address\n                            ];\n    [candidates enumerateObjectsUsingBlock:^(NSString *mailAdress, NSUInteger idx, BOOL *stop) {\n            NSLog(@\"%@, %@\",([Tester testForValidMail:mailAdress]) ? @\"YES\" : @\"NO\", mailAdress );\n        }];\n    }\n    return 0;\n}\n<\/code><\/pre>\n<hr>\n<p>result:<\/p>\n<pre><code>2014-02-14 21:05:49.404 emailcheck[16271:303] YES, m@m.de\n2014-02-14 21:05:49.405 emailcheck[16271:303] NO, m@.de\n2014-02-14 21:05:49.406 emailcheck[16271:303] NO, m@m.e\n2014-02-14 21:05:49.406 emailcheck[16271:303] NO, @m.de\n2014-02-14 21:05:49.406 emailcheck[16271:303] NO, m&lt;at&gt;m.de\n2014-02-14 21:05:49.407 emailcheck[16271:303] NO, mm@mm@mm.de\n2014-02-14 21:05:49.407 emailcheck[16271:303] YES, email@email.email.email.com\n<\/code><\/pre>\n<hr>\n<p>I added another check: not more than one <code>@<\/code><\/p>\n<hr>\n<p>I rewrote my code as Category on NSString<\/p>\n<pre><code>@interface NSString (EmailAddressTest)\n-(BOOL) isValidMailAddress;\n@end\n\n@implementation NSString (EmailAddressTest)\n\n-(BOOL)isValidMailAddress\n{\n     NSRange atRange = [self rangeOfString:@\"@\"];\n\n    BOOL b = NO;\n\n    if ((atRange.location != NSNotFound) \/\/is `@` present\n        &amp;&amp; (atRange.location != 0) \/\/ and is `@` not at the beginning -&gt; left substring exist\n        &amp;&amp; (atRange.location != [self length]-1) \/\/ and not at the end -&gt; right substring exists\n        &amp;&amp; ([[self componentsSeparatedByString:@\"@\"] count] == 2)) \/\/ and is there only one `@`?\n    {\n        \/\/ is there a `.` right of the `@`?\n        NSRange dotRange = [[self substringFromIndex:atRange.length +atRange.location] rangeOfString:@\".\"];\n\n        if((dotRange.location != NSNotFound) \/\/ is there a `.` right of `@`\n           &amp;&amp; (dotRange.location !=0) \/\/ and is it not the very next char after `@`\n           &amp;&amp; ([[self substringFromIndex:[self length]-2] rangeOfString:@\".\"].location == NSNotFound)) \/\/ and the `.` is not the last or second last char\n        {\n            b = YES;\n        }\n    }\n    return b;\n}\n\n@end\n\n\nint main(int argc, const char * argv[])\n{\n\n    @autoreleasepool {\n        [@[@\"m@m.de\", @\"m@.de\", @\"m@m.e\", @\"@m.de\", @\"m&lt;at&gt;m.de\", @\"mm@mm@mm.de\"] enumerateObjectsUsingBlock:^(NSString *mailAdress, NSUInteger idx, BOOL *stop) {\n            NSLog(@\"%@, %@\",([mailAdress isValidMailAddress]) ? @\"YES\" : @\"NO\", mailAdress );\n        }];\n    }\n    return 0;\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved What are some different ways of making an effective email validation method without using regular expression in objective c? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] my attempt @interface Tester : NSObject +(BOOL) testForValidMail:(NSString *)mail; @end @implementation Tester +(BOOL)testForValidMail:(NSString *)string { NSRange atRange = [string rangeOfString:@&#8221;@&#8221;]; BOOL b = NO; if ((atRange.location != NSNotFound) \/\/is `@` present &amp;&amp; (atRange.location != 0) \/\/ and is `@` not at the beginning -&gt; left substring exist &amp;&amp; (atRange.location != string.length-1) \/\/ and not &#8230; <a title=\"[Solved] What are some different ways of making an effective email validation method without using regular expression in objective c?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-what-are-some-different-ways-of-making-an-effective-email-validation-method-without-using-regular-expression-in-objective-c\/\" aria-label=\"More on [Solved] What are some different ways of making an effective email validation method without using regular expression in objective c?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1085,471,737,470],"class_list":["post-32405","post","type-post","status-publish","format-standard","hentry","category-solved","tag-cocoa-touch","tag-ios","tag-nsstring","tag-objective-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] What are some different ways of making an effective email validation method without using regular expression in objective c? 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