从NSString中删除除数字以外的所有内容 [英] Remove all but numbers from NSString

问题描述

我有一个NSString(电话号码)，带有一些括号和连字符，因为某些电话号码已格式化.如何从字符串中删除除数字以外的所有字符?

I have an NSString (phone number) with some parenthesis and hyphens as some phone numbers are formatted. How would I remove all characters except numbers from the string?

推荐答案

旧问题，但如何解决:

  NSString *newString = [[origString componentsSeparatedByCharactersInSet:
                [[NSCharacterSet decimalDigitCharacterSet] invertedSet]] 
                componentsJoinedByString:@""];

它会爆炸一组非数字的源字符串，然后使用空字符串分隔符重新组合它们.不能像挑选字符那样高效，但是代码紧凑得多.

It explodes the source string on the set of non-digits, then reassembles them using an empty string separator. Not as efficient as picking through characters, but much more compact in code.

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