Validate Class

// Name : Validate.h

#import <Foundation/Foundation.h>



@interface Validate : NSObject
{
 
}

+ (BOOL)isNull:(NSString*)str;
+ (BOOL)isValidEmailId:(NSString*)email;
+ (BOOL)isValidMobileNumber:(NSString*)number;
+ (BOOL) isValidUserName:(NSString*)userName;
+ (BOOL) isValidPassword:(NSString*)password;

@end
---------------------------------
// Name : Validate.m
#import "Validate.h"


@implementation Validate

/**
 * Function name isNull                        
 *                                             
 * @params: NSString *str                      
 *                                             
 * @object: function to check a string to null 
 *
 * return BOOL
 */

+ (BOOL)isNull:(NSString*)str{
    if ([[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] isEqualToString:@""] || str==nil) {
        return YES;
    }
    return NO;
}
/**
 * Function name isValidEmailId               
 *                                             
 * @params: NSString                           
 *                                             
 * @object: function to check a valid email id 
 *
 * return BOOL
 */
+ (BOOL)isValidEmailId:(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];
}
/**
 * Function name isValidMobileNumber          
 *                                             
 * @params: NSString                           
 *                                             
 * @object: function to check a valid Mobile #
 *
 * return BOOL
 */
+ (BOOL)isValidMobileNumber:(NSString*)number
{
    number=[number stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    if ([number length]<5 || [number length]>17) {
        return FALSE;
    }
    NSString *Regex = @"^([0-9]*)$";
    NSPredicate *mobileTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", Regex];
   
    return [mobileTest evaluateWithObject:number];
}
/**
 * Function name isValidUserName               
 *                                            
 * @params: NSString                           
 *                                             
 * @object: function to check a valid user name
 *
 * return BOOL
 */
+ (BOOL) isValidUserName:(NSString*)userName{
    NSString *regex=@"^[a-z0-9_-]{5,15}$";
    NSPredicate *userNameTest=[NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
   
    return [userNameTest evaluateWithObject:userName];
}
/**
 * Function name isValidPassword               
 *                                             
 * @params: NSString                           
 *                                             
 * @object: function to check a valid password
 *
 * return BOOL
 */
+ (BOOL) isValidPassword:(NSString*)password{
    NSString *regex=@"^[a-z0-9_-[!#$%&]]{5,15}$";
    NSPredicate *passwordTest=[NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
   
    return [passwordTest evaluateWithObject:password];
}
@end