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修饰符：i	执行对大小写不敏感的匹配。g	执行全局匹配（查找所有匹配而非在找到第一个匹配后停止）。m	执行多行匹配。

一、javascript字符串提供的功能：

var str = 'http://localhost:8089/dist/index.html#/set_product';

1、match(regexp: string | RegExp): RegExpMatchArray | null;/*** Matches a string with a regular expression, and returns an array containing the results of that search.* @param regexp A variable name or string literal containing the regular expression pattern and flags.*/str.match('/^http/i');var e = str.match('/^https/i') ? "https://" : "http://";2、search(regexp: string | RegExp): number/*** Finds the first substring match in a regular expression search.* @param regexp The regular expression pattern and applicable flags.*/用于检索字符串中指定的子字符串，或检索与正则表达式相匹配的子字符串，并返回子串的起始位置。str.search('/^http/i');如果没有匹配到则返回 -13、replace(searchValue: string | RegExp, replaceValue: string): string;/*** Replaces text in a string, using a regular expression or search string.* @param searchValue A string to search for.* @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.*/用于在字符串中用一些字符替换另一些字符，或替换一个与正则表达式匹配的子串。str.replace('/login_page', '/login');

二、使用 RegExp 对象

exec 方法 /*** Executes a search on a string using a regular expression pattern, and returns an array containing the results of that search.* @param string The String object or string literal on which to perform the search.*/exec(string: string): RegExpExecArray | null;test 方法 /*** Returns a Boolean value that indicates whether or not a pattern exists in a searched string.* @param string String on which to perform the search.*/test(string: string): boolean;查找路由，期望得到的结果 /set_productvar patt = /index.html#(.*)/;var mat = patt.exec(str);str.replace(mat[1], '/login');

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