给定一个字符串，例如：
示例字符串与要匹配的预期嵌套字符串。
如何隔离仅知道其前缀和后缀的子字符串，例如之间intended and to match?
使用正则表达式非捕获括号 https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Regular_Expressions#Using_Special_Characters，像这样：
string = 'example string with an intended nested string to match.';
regexp = /(?:intended)(.*)(?:to match)/;
firstMatch = regexp.exec(string)[1]; // " nested string "
问号在正则表达式中有多种用途，括号问号冒号形式(?:更多正则表达式) is the 非捕获括号 https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Regular_Expressions#Using_Special_Characters.
请参阅 MDN 了解更多详细信息exec() https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec， 细绳。match() https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/match, and 常用表达 https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Regular_Expressions.
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