下面的表达式匹配所有小写字母和连字符。
The following expressions match all lowercase letters and the hyphen.
注意：要确定您可以找到指定术语的所有匹配项，并且由于这些术语对于底层字典是未知的，需要全部使用小写字母写入术语。
Note: To make sure, that you can find all occurrences of the specified terms, and because these terms are not known by the underlying dictionary, write the terms in all lower-case letters.
在方括号中，通过使用-（连字符），比如 [a-z]或者所有的小写字母，您可以引用某个范围的字符。
Within the brackets, you can refer to a range of characters by using - (hyphen), as in [a-z] or all lowercase letters.
除首字母大写外、用小写字母打印并排序所有环境变量的多行循环。
A multi-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.
除首字母大写外、用小写字母打印并排序所有环境变量的单行循环。
A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted.
此前的标签和属性可以是大写、小写，或者任意大小写字母的组合，而有效的XHTML 1.0文档则要求所有标签和属性必须一律小写。
Whereas previously tags and attributes could be written in uppercase, lowercase, or any combination thereof, a valid XHTML 1.0 document required all tags and attributes to be lowercase.
例如，图2说明如何通过管道连接find、grep和wc命令，从而寻找名称以小写字母 a开头的所有文件并统计其数量。
For example, Figure 2 shows how a find, grep, and wc command might be connected via pipes to find and count all files with names that begin with lowercase a.
使用map，并且除首字母大写外、以小写字母打印并排序所有环境变量的单行循环。
A one-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted, using map.
使用map，并且除首字母大写外、以小写字母打印并排序所有环境变量的多行循环。
A multi-line loop to print all the environment variables in lowercase, with the first letter uppercase, and sorted, using map.
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.
所有街道的名称都由小写字母构成。
All street names will consist of lowercase alphabetic characters.
返回一个字符串，该字符串中的所有字母都被转换为小写字母。
Returns a string where all alphabetic characters have been converted to lowercase.
返回一个字符串，该字符串中的所有字母都被转换为小写字母。
Returns a string where all alphabetic characters have been converted to lowercase.
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