这是包含被替换值替换了适当正则表达式匹配项的字符串。
This is the string that has the appropriate regular expressions matches replaced with the replacement value.
在元素中指定模式时，请注意，要使用正则表达式来执行匹配和字符串替换。
When specifying patterns in the element, realize that regular expressions are used to perform the matching and string replacement.
为此，上例中使用正则表达式进行替换。
To achieve this in the above example, you use a regular expression to perform the replacement.
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