Check whether NSString starts with aplhabet letter only.

+(BOOL)validateFirstCharacterAsAlphabet:(NSString *)str;

{

    NSRange first = [str rangeOfComposedCharacterSequenceAtIndex:0];

    NSRange match = [str rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet] options:0 range:first];

    if (match.location != NSNotFound) {

        // String starts with a letter

        return YES;

    }

    return NO;

    

}