Expression Input Area 表达式输入框
A regular expression describes the format of a string: With the simplest form of regular expression, you input the text that you want to match.
正则表达式描述字符串的格式：使用最简单的正则表达式格式，您可以输入您希望匹配的文本。
Choosing a date generates an XPath literal expression as input to the function representing the chosen date and time.
选择一个日期将生成XPath字面表达式作为函数输入，表示所选的日期和时间。
Then it creates an in expression with the path expression as input.
然后，它创建一个使用路径表达式作为输入的in表达式。
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