The syntax used is plain old regular expression syntax.
所使用的语法是普通而古老的正则表达式语法。
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。
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