Iphone development uses regular expressions to determine whether the email address and password are correct

 

1. determine the user name, which must be 2-16 characters long

 

-(BOOL) CheckInput :( NSString *) _ text

 

{

 

NSString * Regex = @ "^ \ w {2, 16} $ ";

 

NSPredicate * emailTest = [NSPredicate predicateWithFormat: @ "self matches % @", Regex];

 

Return [emailTest evaluateWithObject: _ text];

 

}

 

 

 

 

2. Determine the mobile phone number. The 11-digit number starting with 1

 

 

-(BOOL) CheckInput :( NSString *) _ text

 

{

 

NSString * Regex = @ "1 \ d {10 }";

 

NSPredicate * emailTest = [NSPredicate predicateWithFormat: @ "self matches % @", Regex];

 

Return [emailTest evaluateWithObject: _ text];

 

}

 

 

 

3. Determine the email address

 

 

 

 

-(BOOL) CheckInput :( NSString *) _ text

 

{

 

NSString * Regex = @ "[A-Z0-9a-z. _ % +-] + @ [A-Za-z0-9.-] + \. [A-Za-z] {2, 4 }";

 

NSPredicate * emailTest = [NSPredicate predicateWithFormat: @ "self matches % @", Regex];

 

Return [emailTest evaluateWithObject: _ text];

 

}

 

 

 

4. Determine the password, 6-16 digits

 

 

-(BOOL) CheckInput :( NSString *) _ text

 

{

 

NSString * Regex = @ "\ w {6, 16 }";

 

NSPredicate * emailTest = [NSPredicate predicateWithFormat: @ "self matches % @", Regex];

 

Return [emailTest evaluateWithObject: _ text];

 

}