从NSString剥离非字母数字字符 [英] Strip Non-Alphanumeric Characters from an NSString

问题描述

我正在寻找一种快速简单的方法从 NSString 中去掉非字母数字字符。可能是使用 NSCharacterSet 的东西，但我累了，似乎没有返回一个字符串中只包含字母数字字符的字符串。

I'm looking for a quick and easy way to strip non-alphanumeric characters from an NSString. Probably something using an NSCharacterSet, but I'm tired and nothing seems to return a string containing only the alphanumeric characters in a string.

推荐答案

我们可以通过分割，然后加入。需要OSX 10.5+的componentsSeparatedByCharactersInSet：

We can do this by splitting and then joining. Requires OS X 10.5+ for the componentsSeparatedByCharactersInSet:

NSCharacterSet *charactersToRemove = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
NSString *strippedReplacement = [[someString componentsSeparatedByCharactersInSet:charactersToRemove] componentsJoinedByString:@""];

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