一是常规字符串（regular string），其中可包含转义字符；二是逐字字符串（verbatim string），其中的（"）被看作是常规的字符，而两个双引号作为双引号的转义表示...
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Replacing them with Spaces or another innocuous character, and then treat the resultant string as if it were just a regular string (with the date in the middle).
用空格或其他无害字符替换它们，然后将结果字符串视为只是一个常规字符串(日期在中间)。
Therefore the regular expression A*B will match the strings AB, AAB, AAAB, or any other string starting with an A and ending with a single B.
因此，正则表达式 A*B 将与字符串 AB 、 AAB 、 AAAB 或任何其它以 A 开头并以单个 B 为结尾的字符串相匹配。
In contrast to re (regular expressions), string functions are generally much faster, and in most cases they are easier to understand and maintain.
与re(规则表达式)相比，string函数通常更快速，大多数情况下他们更易于理解和维护。
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