一些网站的密码由数字和字母组成，另一些必须是数字、字母和特殊符号的组合，还有一些必须有一个大写字母，小写字母和数字组成。
Some Web sites require passwords with numbers and letters, others require numbers, letters and special characters, and still others require a capital letter, a lower-case letter and then a number.
如果一个元素的有效值是“red”、“blue”和“green”，我们想让用户对这些值可以使用任意的大写字母和小写字母组合。
If the valid values for an element are "red," "blue," and "green," we'd like to let our users use any combination of upper - and lowercase letters for those values.
写一个读取文件的程序，把每一行拆分成一个个词，去掉空白和标点符号，然后把所有单词都转换成小写字母的。
Write a program that reads a file, breaks each line into words, strips whitespace and punctuation from the words, and converts them to lowercase.
类名和模块中的常量的第一个字母应该大写，而方法名和变量应该开始用小写字母。
Class names and constants in module scope should be capitalized, while method names and variables should start with a lower case letter.
对于这个问题的目的，一个字被定义为一个大写和小写字母最大序列。
For the purposes of this problem, a word is defined to be a maximal sequence of upper - and lower-case letters.
密码生成器创建一个强大而复杂的随机密码，包括数字，大写字母和小写字母，具有高度的安全和难以破解。
Password Generator creates a strong and complex random passwords, consisting of digits, uppercase and lowercase letters, that are highly secure and difficult to crack.
文本转换属性是用来指定在一个文本中的大写和小写字母。
This text is styled with some of the text formatting properties. The heading uses the text-align, text-transform, and color properties.
文本转换属性是用来指定在一个文本中的大写和小写字母。
This text is styled with some of the text formatting properties. The heading uses the text-align, text-transform, and color properties.
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