从符合规则运算式的回应中撷取文字。
Extract text from the response matching a regular expression.
建构规则运算式的方式非常像是在建立算术运算式。
Regular expressions are constructed much like arithmetic expressions are created.
规则运算式可以做为与所要搜寻之文字进行比较的字元模式。
The regular expression serves as character pattern to compare with the text being searched.
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