在正则表达式的上下文中，模式是字符序列的文本表示法。
In the context of regular expressions, patterns are text representations of sequences of characters.
这种表示法把abap字符串、字符变量或表变量放在圆括号中。
Do this by putting an ABAP string, character variable, or table variable in parentheses.
简单中介处理程序产生一个所有已设置属性的字符串表示法。
The sample mediation handler produces a string representation of all properties that have been set on the mediation.
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