函数地作用是：返回子字符串可以。
中缀索引将匹配在字符串内任意位置的子字符串。
The infix index would match substrings anywhere within the string.
返回正则表达式搜索中第一个子字符串匹配项的位置。
Returns the position of the first substring match in a regular expression search.
这个例子中，只有一个子元素，是个简单字符串。
In this case, there is only one child, and it is a simple string.
替换字符串可能包含对在之前的匹配中捕获的子序列的引用。
The replacement string may contain references to subsequences captured during the previous match.
字符串只是在第一次调用时给出，如strtok 子例程。
The string is provided only on the first call, as with the strtok subroutine.
在这个例子中的每个正规表达式都是测试字符串的子串之一。
Each regular expression in this example is a substring of one of the test strings.
如果级别成员是其父级的唯一子级，并且名称为空或空字符串，则隐藏该级别成员。
A level member is hidden when its name is identical to that of its parent.
如果级别成员是其父级的唯一子级，并且名称为空或空字符串，则隐藏该级别成员。
A level member is hidden when its name is identical to that of its parent.
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