ios - 从 NSString IOS 中删除 "?"

Question

我正在尝试从字符串中删除所有符号，对于除“?”之外的所有符号，下面的代码可以正常工作。

NSString *newString = self.titleString;

NSArray *characters = @[@"<", @"!", @"@", @"#", @"$", @"%", @"^", @"&", @"*", @"(", @")", @",", @"_", @"+", @"|", @">", @"?", @" "];

for (NSString *str in characters) {
    newString = [newString stringByReplacingOccurrencesOfString:str withString:@""];
}

Answer 1

您可以将 stringByReplacingOccurrencesOfString 与正则表达式选项一起使用，NSRegularExpressionSearch:

NSString *output = [input stringByReplacingOccurrencesOfString:@"[<>!@#$%^&*(),_+?| ]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [input length])];

您还可以利用其他正则表达式功能，例如替换所有非字母字符:

NSString *output = [input stringByReplacingOccurrencesOfString:@"\\P{L}" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [input length])];

或者不是 A-Z:

NSString *output = [input stringByReplacingOccurrencesOfString:@"[^a-zA-Z]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [input length])];

这完全取决于您要实现的目标。