Objective-C：在字符串中查找辅音 [英] Objective-C: Find consonants in string

问题描述

我有一个字符串，其中包含辅音和元音的单词。如何从字符串中仅提取辅音？

I have a string that contains words with consonants and vowels. How can I extract only consonants from the string?

NSString *str = @"consonants.";

结果必须是：

cnsnnts

推荐答案

你可以做包含所有元音的字符集（@aeiouy）

You could make a character set with all the vowels (@"aeiouy")

+ (id)characterSetWithCharactersInString:(NSString *)aString

然后使用

- (NSString *)stringByTrimmingCharactersInSet:(NSCharacterSet *)set

方法。

编辑：这只会删除其他帖子中指出的字符串开头和结尾的元音，你可以做的是使用

This will only remove vowels at the beginning and end of the string as pointed out in the other post, what you could do instead is use

- (NSArray *)componentsSeparatedByCharactersInSet:(NSCharacterSet *)separator

然后将组件重新组合在一起。您可能还需要在集合中包含元音的大写版本，如果您还想处理重音（例如等等），您可能还必须包括它。

then stick the components back together. You may also need to include capitalized versions of the vowels in the set, and if you want to also deal with accents (à á è è ê ì etc...) you'll probably have to include that also.

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