正則表達式iphone

Question

我怎麼能chceck在iPhone上用regularexpressions NSStrring只包含這個字符：a-zA-Z數字0-9或specialChars中：!@#$%^&*()_+-={}[]:"|;'\<>?,./

Answer 1

NSCharacterSet *charactersToRemove = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 "] invertedSet]; 
NSString *stringValueOfTextField = [[searchBar.text componentsSeparatedByCharactersInSet:charactersToRemove] 
            componentsJoinedByString:@""]; 

試試這個： :::

Answer 2

爲了這個目的，你可以使用標準的類NSRegularExpression

Answer 3

NSRegularExpression *regex = [NSRegularExpression 
     regularExpressionWithPattern:@"\w[!@#$%^&*()_+-={}\[\]:\"|;'\<>?,./]" 
          options:NSRegularExpressionCaseInsensitive 
           error:&error]; 

NSUInteger numberOfMatches = [regex numberOfMatchesInString:string 
                options:0 
                 range:NSMakeRange(0, [string length])]; 

請注意NSRegularExpression僅適用於iOS 4及以上版本。