从 NSString 中删除除数字之外的所有数字 [英] Remove all but numbers from NSString

问题描述

我有一个带有括号和连字符的 NSString(电话号码)，因为某些电话号码已被格式化.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

老问题，但是怎么样:

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

它将源字符串分解为一组非数字，然后使用空字符串分隔符重新组合它们.不如挑选字符高效，但代码更紧凑.

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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