检查NSString的特殊字符 [英] Check NSString for special characters

问题描述

我想检查NSString是否包含特殊字符，即az，AZ和0-9以外的任何字符。

I want to check an NSString for special characters, i.e. anything except a-z, A-Z and 0-9.

我不需要检查多少特殊字符存在或它们的位置，我只需要知道一个特定的字符串是否包含任何或。

I don't need to check how many special characters are present, or their positions, I just need to know whether a particular string contains any or not. If it does, then I want to be able to display "Error!", or something similar.

例如， jHfd9982 可以显示错误！ asdJh992 @ 不是。

For example, jHfd9982 is OK but asdJh992@ is not.

此外，不允许使用重音符号，变音符号等字母。

Also, letters with accents, diacritical, etc. should not be allowed.

我该如何解决这个问题？

How would I go about this?

谢谢！

>

推荐答案

NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ0123456789"] invertedSet];

if ([aString rangeOfCharacterFromSet:set].location != NSNotFound) {
  NSLog(@"This string contains illegal characters");
}

您还可以使用regex（此语法来自RegexKitLite： http://regexkit.sourceforge.net ）：

You could also use a regex (this syntax is from RegexKitLite: http://regexkit.sourceforge.net ):

if ([aString isMatchedByRegex:@"[^a-zA-Z0-9]"]) {
  NSLog(@"This string contains illegal characters");
}

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