iphone - 从 NSString 中删除除 + - 运算符之外的所有特殊字符

Question

我想删除所有特殊字符除了+、空格和-。怎么可能？

我的字符串是

Äî;a[bRa]Co-Founder MobÄ: +91 9711700008

输出:

abRaCo-Founder Mob +91 9711700008

根据下面的答案，我更新了我的代码，但仍然没有成功。

NSMutableCharacterSet *special = [NSMutableCharacterSet characterSetWithCharactersInString:@"+ -"];
[special formUnionWithCharacterSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]];


NSString *temp=@"gaurav 1!@#!#@! kant !@#!@#!@#12kestwal ";

NSString *yourString = [temp stringByTrimmingCharactersInSet:special];

NSLog(@"%@",yourString);

我错过了什么？

Answer 1

比 mega func 短得多。 :D 以上:

id s = @"$bla++$bleb+$blub-$b";
NSMutableCharacterSet *ch = [[NSCharacterSet alphanumericCharacterSet] mutableCopy];
[ch invert];
[ch removeCharactersInString:@"+-"]; //make sure its not removed
s = [[s componentsSeparatedByCharactersInSet:ch] componentsJoinedByString:@""];
NSLog(@"%@ - %@",ch, s);

在这个例子中 $ 被删除了