一些常用的正则表达式

//6到15位数字或字母的字符串
NSString * regex        = @"(^[A-Za-z0-9]{6,15}$)"; 

NSPredicate * pred      = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; 

BOOL isMatch            = [pred evaluateWithObject:@"123456ABCde"];

//邮箱  + (BOOL) validateEmail:(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];  }          //手机号码验证  + (BOOL) validateMobile:(NSString *)mobile  {      //手机号以13， 15，18开头，八个 \d 数字字符      NSString *phoneRegex = @"^((13[0-9])|(15[^4,\\D])|(18[0,0-9]))\\d{8}$";      NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex];      return [phoneTest evaluateWithObject:mobile];  }          //车牌号验证  + (BOOL) validateCarNo:(NSString *)carNo  {      NSString *carRegex = @"^[\u4e00-\u9fa5]{1}[a-zA-Z]{1}[a-zA-Z_0-9]{4}[a-zA-Z_0-9_\u4e00-\u9fa5]$";      NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",carRegex];      NSLog(@"carTest is %@",carTest);      return [carTest evaluateWithObject:carNo];  }          //车型  + (BOOL) validateCarType:(NSString *)CarType  {      NSString *CarTypeRegex = @"^[\u4E00-\u9FFF]+$";      NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",CarTypeRegex];      return [carTest evaluateWithObject:CarType];  }          //用户名  + (BOOL) validateUserName:(NSString *)name  {      NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";      NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];      BOOL B = [userNamePredicate evaluateWithObject:name];      return B;  }          //密码  + (BOOL) validatePassword:(NSString *)passWord  {      NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";      NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];      return [passWordPredicate evaluateWithObject:passWord];  }          //昵称  + (BOOL) validateNickname:(NSString *)nickname  {      NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{4,8}$";      NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];      return [passWordPredicate evaluateWithObject:nickname];  }          //身份证号  + (BOOL) validateIdentityCard: (NSString *)identityCard  {      BOOL flag;      if (identityCard.length <= 0) {          flag = NO;          return flag;      }      NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";      NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];      return [identityCardPredicate evaluateWithObject:identityCard];  }