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    <p>Refer @Bala's answer</p> <pre><code>NSString *call = @"+91-9884715715"; // Search for the "+a" starting at the end of string NSRange range = [call rangeOfString:@"+" options:NSBackwardsSearch]; // What did we find if (range.length &gt; 0) NSLog(@"Range is: %@", NSStringFromRange(range)); </code></pre> <h2>Edit</h2> <p>Refer following link: <a href="https://stackoverflow.com/questions/5765654/textfield-validation-with-regular-expression/5784131#5784131">TextField Validation With Regular Expression</a></p> <p>Change the line </p> <pre><code>- (BOOL)validateInputWithString:(NSString *)aString { NSString * const regularExpression = @"^([+]{1})([0-9]{2,6})([-]{1})([0-9]{10})$"; NSError *error = NULL; </code></pre> <p>Add the code</p> <pre><code>- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { char *x = (char*)[string UTF8String]; //NSLog(@"char index is %i",x[0]); if([string isEqualToString:@"-"] || [string isEqualToString:@"+"] || [string isEqualToString:@"0"] || [string isEqualToString:@"1"] || [string isEqualToString:@"2"] || [string isEqualToString:@"3"] || [string isEqualToString:@"4"] || [string isEqualToString:@"5"] || [string isEqualToString:@"6"] || [string isEqualToString:@"7"] || [string isEqualToString:@"8"] || [string isEqualToString:@"9"] || x[0]==0 ) { NSUInteger newLength = [textField.text length] + [string length] - range.length; return (newLength &gt; 18) ? NO : YES; } else { return NO; } } </code></pre> <h2>Edit</h2> <p>Tested with demo:</p> <pre><code> //// Button Press Event -(IBAction)Check:(id)sender{ BOOL check = [self validateInputWithString:TextField.text]; if(check == YES){ NSLog(@"Hii"); NSString *string= [NSString stringWithFormat:@"%@", TextField.text]; NSArray *first = [string componentsSeparatedByString:@"-"]; NSString *second = [first objectAtIndex:1]; NSString *third = [first objectAtIndex:0]; if([second length] &lt; 11){ NSLog(@"bang"); } else{ NSLog(@"Fault"); } if([third length] &gt; 3 || [third length] &lt; 7){ NSLog(@"Bang"); } else{ NSLog(@"fault"); } } else{ NSLog(@"FAULT"); } } </code></pre>
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    1. POHow to perform validation on textfield for phone number entered by user in iPhone?
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    1. COif you need write only +,-,and number characters then i will updated my code
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    2. COi want to check if the first value entered by the user is '+'.If not then it is not valid.Between + and - there will be minimum two digits for country code and after - mobile number is which will be of ten digits
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    3. COcould u help me please actually this is working but i am having little bit problem i.e my country code which is second part of regular expression is dynamic i.e user can enter code which length will be >= {2} and <={6} but not less {2} and mobile number should be strictly 10 digits long
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