Sed has a limited set of commands, but these combined with regular expression syntax and the hold buffer make for some amazing capabilities.
Sed提供了一组有限的命令，但是这些命令结合了正则表达式语法和保持缓存，因而实现了某些非常令人吃惊的功能。
New functions include regular expression syntax for pattern matching, new date functions such as current date, and new numeric functions such as floor, ceiling and round.
新的功能包括用于模式匹配的正则表达式语法，新的日期函数比如当前日期，还有新的算术函数比如floor,ceiling和round。
Sed USES regular expression syntax to search for and replace text selectively in the pattern space as well as to control which lines of text should be operated on by sets of editing commands.
Sed使用正则表达式语法在模式空间中搜索并有选择地替换文本，以及决定对哪些文本行应用编辑命令。
Review the correct regular expression syntax located in the topic "regular Expressions."
复查位于主题“正则表达式”中的正确正则表达式语法。
Review the correct regular expression syntax located in the topic "regular Expressions."
复查位于主题“正则表达式”中的正确正则表达式语法。
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