Email validation on textField in iOS - ios

Question

In iOS App, how to add Email validation on UITextField?

Answer 1

Use NSPredicate and Regex:
- (BOOL)validateEmailWithString:(NSString*)email
{
NSString *emailRegex = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
return [emailTest evaluateWithObject:email];
}
For a bunch of emails separated by a comma:
- (NSMutableArray*)validateEmailWithString:(NSString*)emails
{
NSMutableArray *validEmails = [[NSMutableArray alloc] init];
NSArray *emailArray = [emails componentsSeparatedByString:#","];
for (NSString *email in emailArray)
{
NSString *emailRegex = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
if ([emailTest evaluateWithObject:email])
[validEmails addObject:email];
}
return [validEmails autorelease];
}
Edited Answer: (It also validates extra dots )
- (BOOL)validateEmailWithString:(NSString*)checkString
{
BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
NSString *stricterFilterString = #"[A-Z0-9a-z\\._%+-]+#([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
NSString *laxString = #".+#([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
return [emailTest evaluateWithObject:checkString];
}

Answer 2

Try this out
This checks exactly with top level domain names along with validation.
- (BOOL)validateEmail:(NSString *)inputText {
NSString *emailRegex = #"[A-Z0-9a-z][A-Z0-9a-z._%+-]*#[A-Za-z0-9][A-Za-z0-9.-]*\\.[A-Za-z]{2,6}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
NSRange aRange;
if([emailTest evaluateWithObject:inputText]) {
aRange = [inputText rangeOfString:#"." options:NSBackwardsSearch range:NSMakeRange(0, [inputText length])];
int indexOfDot = aRange.location;
//NSLog(#"aRange.location:%d - %d",aRange.location, indexOfDot);
if(aRange.location != NSNotFound) {
NSString *topLevelDomain = [inputText substringFromIndex:indexOfDot];
topLevelDomain = [topLevelDomain lowercaseString];
//NSLog(#"topleveldomains:%#",topLevelDomain);
NSSet *TLD;
TLD = [NSSet setWithObjects:#".aero", #".asia", #".biz", #".cat", #".com", #".coop", #".edu", #".gov", #".info", #".int", #".jobs", #".mil", #".mobi", #".museum", #".name", #".net", #".org", #".pro", #".tel", #".travel", #".ac", #".ad", #".ae", #".af", #".ag", #".ai", #".al", #".am", #".an", #".ao", #".aq", #".ar", #".as", #".at", #".au", #".aw", #".ax", #".az", #".ba", #".bb", #".bd", #".be", #".bf", #".bg", #".bh", #".bi", #".bj", #".bm", #".bn", #".bo", #".br", #".bs", #".bt", #".bv", #".bw", #".by", #".bz", #".ca", #".cc", #".cd", #".cf", #".cg", #".ch", #".ci", #".ck", #".cl", #".cm", #".cn", #".co", #".cr", #".cu", #".cv", #".cx", #".cy", #".cz", #".de", #".dj", #".dk", #".dm", #".do", #".dz", #".ec", #".ee", #".eg", #".er", #".es", #".et", #".eu", #".fi", #".fj", #".fk", #".fm", #".fo", #".fr", #".ga", #".gb", #".gd", #".ge", #".gf", #".gg", #".gh", #".gi", #".gl", #".gm", #".gn", #".gp", #".gq", #".gr", #".gs", #".gt", #".gu", #".gw", #".gy", #".hk", #".hm", #".hn", #".hr", #".ht", #".hu", #".id", #".ie", #" No", #".il", #".im", #".in", #".io", #".iq", #".ir", #".is", #".it", #".je", #".jm", #".jo", #".jp", #".ke", #".kg", #".kh", #".ki", #".km", #".kn", #".kp", #".kr", #".kw", #".ky", #".kz", #".la", #".lb", #".lc", #".li", #".lk", #".lr", #".ls", #".lt", #".lu", #".lv", #".ly", #".ma", #".mc", #".md", #".me", #".mg", #".mh", #".mk", #".ml", #".mm", #".mn", #".mo", #".mp", #".mq", #".mr", #".ms", #".mt", #".mu", #".mv", #".mw", #".mx", #".my", #".mz", #".na", #".nc", #".ne", #".nf", #".ng", #".ni", #".nl", #".no", #".np", #".nr", #".nu", #".nz", #".om", #".pa", #".pe", #".pf", #".pg", #".ph", #".pk", #".pl", #".pm", #".pn", #".pr", #".ps", #".pt", #".pw", #".py", #".qa", #".re", #".ro", #".rs", #".ru", #".rw", #".sa", #".sb", #".sc", #".sd", #".se", #".sg", #".sh", #".si", #".sj", #".sk", #".sl", #".sm", #".sn", #".so", #".sr", #".st", #".su", #".sv", #".sy", #".sz", #".tc", #".td", #".tf", #".tg", #".th", #".tj", #".tk", #".tl", #".tm", #".tn", #".to", #".tp", #".tr", #".tt", #".tv", #".tw", #".tz", #".ua", #".ug", #".uk", #".us", #".uy", #".uz", #".va", #".vc", #".ve", #".vg", #".vi", #".vn", #".vu", #".wf", #".ws", #".ye", #".yt", #".za", #".zm", #".zw", nil];
if(topLevelDomain != nil && ([TLD containsObject:topLevelDomain])) {
//NSLog(#"TLD contains topLevelDomain:%#",topLevelDomain);
return TRUE;
}
/*else {
NSLog(#"TLD DOEST NOT contains topLevelDomain:%#",topLevelDomain);
}*/
}
}
return FALSE;
}

Answer 3

Use the below code:-
NSString *emailRegEx = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegEx];
//Valid email address
if ([emailTest evaluateWithObject:userMailTextField.text] == YES)
{
//Do Something
}
else
{
NSLog(#"email not in proper format");
}
userMailTextField is the name of my textField (use your own).
I hope this code will help you!!!

Answer 4

Use Below code for "Swift language" For Email Validation
func ValidateEmailString (strEmail:NSString) -> Bool
{
let emailRegex = "[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
let emailText = NSPredicate(format:"SELF MATCHES [c]%#",emailRegex)
return (emailText.evaluate(with: strEmail))
}
Thanks :)

Answer 5

NSRegularExpression is the Best Way to Validate Email Addresses with iOS 4.x and Later.
-(BOOL) validateEmail:(NSString*) emailString
{
NSString *regExPattern = #"^[A-Z0-9._%+-]+#[A-Z0-9.-]+\\.[A-Z]{2,4}$";
NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
NSLog(#"%i", regExMatches);
if (regExMatches == 0) {
return NO;
}
else
return YES;
}
Usage :
if([self validateEmail:#"something#domain.com"]) {
//Email Address is valid.
}
else {
//Email Address is invalid.
}

Answer 6

- (BOOL)validateEmailAddress:(NSString*)yourEmail
{
//create a regex string which includes all email validation
NSString *emailRegex = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
//create predicate with format matching your regex string
NSPredicate *email = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
//return True if your email address matches the predicate just formed
return [email evaluateWithObject:yourEmail];`
}

Answer 7

--it's easy to validate your email id by calling validateEmail method:
-(BOOL)validateEmail:(NSString *)email
{
NSString *emailRegex = #"[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*#(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
return [emailTest evaluateWithObject:email];
}
Verify your email id here....
BOOL eb=[self validateEmail:**youremailtextfield**];
if(!eb)
{
UIAlertView *alertsuccess = [[UIAlertView alloc] initWithTitle:#"Sorry" message:#"Please enter correct email id"
delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alertsuccess show];
[alertsuccess release];
}

Answer 8

Here the simple way to validate email in obj c
if(![self validEmail:self.emailTxtFld.text]) {
// here show alert not a valid email id
}
here valid email id method is
- (BOOL) validEmail:(NSString*) emailString {
if([emailString length]==0){
return NO;
}
NSString *regExPattern = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
if (regExMatches == 0) {
return NO;
} else {
return YES;
}
}
In Swift 3.0 Version
if !validEmailId(inputText: userNameTxtFld.text!) {
print("Not Valid Emaild")
}
else {
print("valid email id")
}
func validEmailId(inputText: String)-> Bool {
print("validate emilId: \(inputText)")
let emailRegEx = "^(?:(?:(?:(?: )*(?:(?:(?:\\t| )*\\r\\n)?(?:\\t| )+))+(?: )*)|(?: )+)?(?:(?:(?:[-A-Za-z0-9!#$%&’*+/=?^_'{|}~]+(?:\\.[-A-Za-z0-9!#$%&’*+/=?^_'{|}~]+)*)|(?:\"(?:(?:(?:(?: )*(?:(?:[!#-Z^-~]|\\[|\\])|(?:\\\\(?:\\t|[ -~]))))+(?: )*)|(?: )+)\"))(?:#)(?:(?:(?:[A-Za-z0-9](?:[-A-Za-z0-9]{0,61}[A-Za-z0-9])?)(?:\\.[A-Za-z0-9](?:[-A-Za-z0-9]{0,61}[A-Za-z0-9])?)*)|(?:\\[(?:(?:(?:(?:(?:[0-9]|(?:[1-9][0-9])|(?:1[0-9][0-9])|(?:2[0-4][0-9])|(?:25[0-5]))\\.){3}(?:[0-9]|(?:[1-9][0-9])|(?:1[0-9][0-9])|(?:2[0-4][0-9])|(?:25[0-5]))))|(?:(?:(?: )*[!-Z^-~])*(?: )*)|(?:[Vv][0-9A-Fa-f]+\\.[-A-Za-z0-9._~!$&'()*+,;=:]+))\\])))(?:(?:(?:(?: )*(?:(?:(?:\\t| )*\\r\\n)?(?:\\t| )+))+(?: )*)|(?: )+)?$"
let emailTest = NSPredicate(format:"SELF MATCHES %#", emailRegEx)
let result = emailTest.evaluate(with: inputText)
return result
}

Answer 9

This works exactly
-(BOOL) emailValidation:(NSString *)emailTxt
{
NSString *emailRegex = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailRegex];
return [emailTest evaluateWithObject:emailTxt];
}

Answer 10

perfect validation for email. try this.
- (BOOL)validateEmailWithString:(NSString*)checkString
{
NSString *laxString = #".+#([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", laxString];
return [emailTest evaluateWithObject:checkString];
}

Answer 11

I'm author of DCKit library, which has DCMandatoryEmailTextField. This class does email validation automatically and highlights/unhighlights the text field when the user is typing a value:
Check it out: https://github.com/andrew8712/DCKit

Answer 12

Swift
func validateEmail(email:String) -> Bool {
let stricterFilter = false
let stricterFilterString = "[A-Z0-9a-z\\._%+-]+#([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}"
let laxString = ".+#([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
let emailRegex = stricterFilter ? stricterFilterString : laxString
let emailTest = NSPredicate(format: "SELF MATCHES %#", emailRegex)
return emailTest.evaluate(with: email);
}

Answer 13

Function:
- (BOOL)validateEmail:(NSString *)enteredEmailID
{
//checking valid email id or not
NSString *emailReg = #"[A-Z0-9a-z._%+-]+#[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:#"SELF MATCHES %#", emailReg];
return [emailTest evaluateWithObject:enteredEmailID];
}
Call it like:
if ([self validateEmail: textField.text])
{
//NSLog(#"Valid Email");
}
else
{
//NSLog(#"Invalid Email");
}
EDIT:
You can do this into textfield did end editing delegates or textfield should character change delegates

Answer 14

A version using NSRegularExpression and regex pattern copied from OWASP_Validation_Regex_Repository
+ (BOOL) isValidEmail:(NSString *)emailString {
NSError *error = NULL;
/**
* #see OWASP_Validation_Regex_Repository
*/
NSString *emailPattern = #"^[a-zA-Z0-9_+&*-]+(?:\\.[a-zA-Z0-9_+&*-]+)*#(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,7}$";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:emailPattern
options:NSRegularExpressionCaseInsensitive
error:&error];
NSUInteger matchCount = [regex numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
return matchCount > 0;
}