They provide a terse syntax for specifying complex matches, one which is typically translated into a state machine behind the scenes for optimum performance.
它们提供了一套简明的语法来说明复杂的匹配，其中一种通常被翻译成后台状态机来获得优化的性能。
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The rest of the examples in this technical article use Windows syntax. So, if you are on a UNIX machine, please adjust the syntax accordingly.