The child is the character information item , meaning that the item contains alphanumerical characters 子项是字符信息项，即包含字母数字字符的项。
Passwords must be at least 7 characters long , and at least one of the characters must be non - alphanumeric 密码必须至少为7个字符，并且其中至少有一个字符为非字母数字字符。
Method defined here takes an input string and strips all non - alphanumeric characters except the following 此处定义的cleaninput方法接受输入字符串并去除所有非字母数字字符，以下字符除外：
A terminal containing less than a full alphanumeric keyboard ; for example , one containing ten numeric keys plus control keys 一种终端，它的键盘不包括全套的字母数字字符键；例如，只包括十个数字键以及若干控制键。
Specifies whether the comparison sorts all punctuation symbols , except the hyphen and apostrophe , before the alphanumeric characters 指定比较是否对标点符号排序，并将除了连字符和撇号外的所有标点符号排在字母数字字符之前。
Property returns the minimum number of special , non - alphanumeric characters that must be entered to create a valid password for the membership provider specified in the 属性中指定的成员资格提供程序创建有效密码时必须输入的最少特殊非字母数字字符数。
Our way around this was to limit our character counts to the twenty most frequently occurring non - alphanumeric characters in a pool of c , c , java , and python code 我们的方法是将字符统计限制到c 、 c + + 、 java和python代码字符库中最常用的20个非字母数字字符。
The match must occur on word boundaries that is , at the first or last characters in words separated by any nonalphanumeric characters （非字母数字）字符之间的边界上。匹配必须出现在单词边界上，即出现在由任何非字母数字字符分隔的单词中第一个或最后一个字符上。
If you store hashed passwords in any way , you should require your users to choose passwords that are not common words and that contain some numbers and non - alphanumeric characters to help prevent dictionary attacks 如果通过任何方式存储哈希密码，则您应该要求用户在选择密码时不使用常用的单词，并且密码应包含一些数字和非字母数字字符以防止字典攻击。
Automatic command generation logic fails if column names or table names contain any special characters , such as spaces , periods , quotation marks , or other nonalphanumeric characters , even if delimited by brackets 如果列名称或表名称包含任何特殊字符（如空格、句点、问号或其他非字母数字字符） ，即使这些字符用中括号分隔，自动命令生成逻辑仍会失败。支持格式为catalog . schema . table
