去除两端的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]
去掉特殊字符串
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@／：；（）¥「」＂、[]{}#%-*+=_//|~＜＞$€^•'@#$%^&*()_+'/"""];
由于NSString中有全角符号和半角符号, 因此有些符号要包括全角和半角的
然后调用stringByTrimmingCharactersInSet
NSString *trimmedString = [string stringByTrimmingCharactersInSet:set];
trimmedString就是过滤后的字符串
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本文标题：NSString
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