一:正則表達式再用

pragma 正則匹配手機號

(BOOL)checkTelNumber:(NSString ) telNumber
{
   NSString pattern = @^ 1 +[ 3578 ]+\d{ 9 };
   NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:telNumber];
   return isMatch;
}

pragma 正則匹配用戶密碼 6 - 18 位數字和字母組合

(BOOL)checkPassword:(NSString ) password
{
   NSString pattern = @^(?![ 0 - 9 ]+$)(?![a-zA-Z]+$)[a-zA-Z0- 9 ]{ 6 , 18 };
   NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:password];
   return isMatch;

}
pragma 正則匹配用戶姓名, 20 位的中文或英文

(BOOL)checkUserName : (NSString ) userName
{
   NSString pattern = @^[a-zA-Z一-龥]{ 1 , 20 };
   NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:userName];
   return isMatch;

}
pragma 正則匹配用戶身份證號 15 或 18 位

(BOOL)checkUserIdCard: (NSString ) idCard
{
   NSString pattern = @(^[ 0 - 9 ]{ 15 }$)|([ 0 - 9 ]{ 17 }([ 0 - 9 ]|X)$);
   NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:idCard];
   return isMatch;
}

pragma 正則匹員工號, 12 位的數字

(BOOL)checkEmployeeNumber : (NSString ) number
{
   NSString pattern = @^[ 0 - 9 ]{ 12 };
NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:number];
   return isMatch;


}
pragma 正則匹配URL

(BOOL)checkURL : (NSString ) url
{
   NSString pattern = @^[ 0 -9A-Za-z]{ 1 , 50 };
   NSPredicate *pred = [NSPredicate predicateWithFormat: @SELF MATCHES %@, pattern];
   BOOL isMatch = [pred evaluateWithObject:url];
   return isMatch;

}
二 TextFiled的代理方法
//////// 特殊字符的限制輸入，價格金額的有效性判斷
define myDotNumbers     @"0123456789.\n"
define myNumbers          @"0123456789\n"
-(void) createTextFiled {
    textfield1 = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    textfield1.delegate = self;
    [self addSubview:textfield1_];

 textfield2_ = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
textfield2_.delegate = self;
[self addSubview:textfield2_];

 textfield3_ = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
textfield3_.delegate = self;
[self addSubview:textfield3_];


}
-(void)showMyMessage:(NSString*)aInfo {

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:aInfo delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];
[alertView show];
[alertView release];


}

(BOOL)textField:(UITextField )textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString )string {
  NSCharacterSet *cs;
  if ([textField isEqual:textfield1_]) {

  cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers] invertedSet];
  NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
  BOOL basicTest = [string isEqualToString:filtered];
  if (!basicTest) {
      [self showMyMessage:@"只能輸入數字"];
      return NO;
  }

}
  else if ([textField isEqual:textfield2_]) {

  cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers] invertedSet];
  NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
  BOOL basicTest = [string isEqualToString:filtered];
  if (!basicTest) {
      [self showMyMessage:@"只能輸入數字"];
      return NO;
  }

}
  else if ([textField isEqual:textfield3_]) {

  NSUInteger nDotLoc = [textField.text rangeOfString:@"."].location;
  if (NSNotFound == nDotLoc && 0 != range.location) {
      cs = [[NSCharacterSet characterSetWithCharactersInString:myDotNumbers] invertedSet];
  }
  else {
      cs = [[NSCharacterSet characterSetWithCharactersInString:myNumbers] invertedSet];
  }
  NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
  BOOL basicTest = [string isEqualToString:filtered];
  if (!basicTest) {

      [self showMyMessage:@"只能輸入數字和小數點"];
      return NO;
  }
  if (NSNotFound != nDotLoc && range.location > nDotLoc + 3) {
      [self showMyMessage:@"小數點后最多三位"];
      return NO;
  }

}
  return YES;
}


</pre>