如果忽略掉它，regex将匹配开头为字母、包含2至9个字母数字字符以及任意数目的任何其他字符的所有字符串。
If you omit it, your regex would match any string that begins with a letter, contains two to nine alphanumeric characters, and any number of any other characters.
这个语法使用的是PRCE (PerlCompatibleRegularExpressions)，一种用来匹配任意目标字符串模式的有效方法。
The syntax USES PRCE (Perl Compatible Regular Expressions), a very powerful way of matching any desired string pattern.
如果这两个字符串中有任意一个与参数相匹配，那么函数就会返回相应的鱼饵数组。
If either one of those strings matches the parameter, then the appropriate array of lures is returned.
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.
第一个规则表达式将与后面依次跟有任意数量的空格或制表键以及开始圆括号的字符串“main ”匹配。
The first regular expression will match the string "main" followed by any number of Spaces or tabs, followed by an open parenthesis.
第一个规则表达式将与后面依次跟有任意数量的空格或制表键以及开始圆括号的字符串“main ”匹配。
The first regular expression will match the string "main" followed by any number of Spaces or tabs, followed by an open parenthesis.
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