在一个方形图像内至多可编码约4,000个字母数字符号，它们刚刚好可以替代那种窄的收据条。
Able to encode a maximum of about 4,000 alphanumeric characters in a square image, they lend themselves nicely to placement on a narrow receipt slip.
不过想出一连串的字母数字符号往往烦人且让人来气，所以就有相对来说不多的人对此困惑不已。他们青睐简单易猜的单词来做密码。
But coming up with complex concatenations of alphanumeric symbols tends to be tedious and offputting, so relatively few people bother, plumping instead for simple, and easily guessable, words.
一台大型计算机的即时存取存储器可容纳多达100000个“单词”——字母或数字字符的字符串——随时可用。
The instant access memory of a large computer may hold up to 100,000 "words"—string of alphabetic or numerical characters—ready for instant use.
当学龄前的孩子看到如数字和字母的字符时，在一定程度上，他们会理解。
When preschool children see symbols such as Numbers and letters, they perceive them in parts.
W3Eval的变量是不限长度的大写字母和数字序列，其首字符必须是字母。
A variable in W3Eval is an unlimited-length sequence of uppercase letters and digits, the first of which must be a letter.
用户名应该由字母数字字符组成，并且对于组织内部所有的系统都应该是有效的结构，以便每个人只使用一个用户名。
The user name should consist of alphanumeric characters and be a valid structure for all systems within an organization so that each person only has one user name.
上面的主程序逻辑将搜索匹配简单标准的字母和数字字符串。
The main program logic above searches for letter and number strings matching our simplistic criteria.
标识符的其他字符必须是字母，数字或下划线。
All other characters in an identifier must be letters, digits, or the underscore.
为提供安全性，一些网站要求用户密码必须混合使用字母，数字甚至特殊字符。
To improve security, some Web sites are forcing users to mix letters, numbers and even symbols in their passwords.
这段代码接受来自用户的受感染数据，检查要打印的字符只有字母和数字字符以及空格符，以此来提供安全保护。
This piece of code takes up tainted data from the user, ensuring protection as it checks that the characters to be printed are only alphanumeric characters and Spaces.
节点名结构中只包含字母数字字符。
The node name structure consists of alphanumeric characters only.
消息不得超过160个字母数字字符且不包含图像或图形。
Messages must be no longer than 160 alphanumeric characters and contain no images or graphics.
确保您的密码具有某一长度(八个或更多字符)，并包含大写字母、数字和特定的字符，如！
Making sure your password is of a certain length (eight or more characters) and contains uppercase letters, Numbers, and special characters — like!
如下所示，提供的每个文件中的每一行将被转换为变形后的字母数字字符串。
As shown below, each line in every file provided will be transformed into an inflected alphanumeric string.
密码中字母数字字符的最小数目。
The minimum number of alphanumeric characters in a password.
通常是大写字母、小写字母、特殊字符和数字。
Usually this is upper case, lower case, special character and a number.
对于输入不知道的字符，或是难于输入的字符(例如长的包括字母和数字的字符)是比较棘手的。
It is troublesome to try to enter Strings that you do not know offhand, or that would be difficult to type, like long alphanumeric Strings.
密码中非字母数字字符的最小数目。
The minimum number of non-alphabetic characters in a password.
确保概要文件名只包含字母数字式字符串，并且长度没有超过128个字符。
Make sure that the profile name contains alphanumeric characters only and does not exceed 128 characters.
节点名应该只由字母数字字符组成。
The node name structure should consist of alpha-numeric characters only.
子项是字符信息项，即包含字母数字字符的项。
The child is the character information item, meaning that the item contains alphanumerical characters.
软件包本身的名称(不是文件名，仅仅是软件包的名称)可以包含小写字母、数字以及“-”和“+”字符。
The name of the package itself (not the filename, just the name of the package) can contain lowercase letters, Numbers, and the "-" and "+" characters.
密码包含不同的字符：数字、字母、必要的特殊字符。
Vary different types of characters in your passwords; include Numbers, letters and special characters when possible.
四到七个小写字母和字母数字字符，以字母开头。
Four to seven lowercase and alphanumeric characters, beginning with a letter.
每个用户名至少要包含3个但不多于10个字母数字字符，并且必须以字母为开头。
Each user name must be at least three, but not more than 10 alphanumeric characters and must begin with a letter.
这些规则指定密码可以包含哪些内容，例如，密码是否应当只包含字母或字母数字字符。
These rules specify what a password can consist of, such as whether a password should consist of only alphabets or alphanumeric characters. The following rules are supported.
如果忽略掉它，regex将匹配开头为字母、包含2至9个字母数字字符以及任意数目的任何其他字符的所有字符串。
If you omit it, your regex would match any string that begins with a letter, contains two to nine alphanumeric characters, and any number of any other characters.
对于所有将被输出到另一web页面的数据，特别是所有从外部输入接收的数据来说，要在所有非字母数字的字符上使用编码。
For any data that will be output to another web page, especially any data that was received from external inputs, use the appropriate encoding on all non-alphanumeric characters.
生成一个安全的密码，其中不包含含糊(即容易混淆的)字符，至少包含一个非字母数字字符。
Generate a single, secure password with no ambiguous, or easily confused, characters and at least one non-alphanumeric character.
生成一个安全的密码，其中不包含含糊(即容易混淆的)字符，至少包含一个非字母数字字符。
Generate a single, secure password with no ambiguous, or easily confused, characters and at least one non-alphanumeric character.
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