iOS-过滤特殊字符

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通讯录复制过来的手机号为13位，含2位特殊字符

//过滤特殊字符
NSCharacterSet *setToRemove = [[ NSCharacterSet characterSetWithCharactersInString"0123456789"]invertedSet];
NSString *ph = [[phoneStr componentsSeparatedByCharactersInSet:setToRemove]componentsJoinedByString""];