如何在RegExp匹配中忽略HTML标签:

var text = '<p>The <b>tiger</b> (<i>Panthera tigris</i>) is the largest <a href="/wiki/Felidae" title="Felidae">cat</a> <a href="/wiki/Species" title="Species">species</a>, most recognizable for its pattern of dark vertical stripes on reddish-orange fur with a lighter underside. The species is classified in the genus <i><a href="/wiki/Panthera" title="Panthera">Panthera</a></i> with the <a href="/wiki/Lion" title="Lion">lion</a>, <a href="/wiki/Leopard" title="Leopard">leopard</a>, <a href="/wiki/Jaguar" title="Jaguar">jaguar</a>, and <a href="/wiki/Snow_leopard" title="Snow leopard">snow leopard</a>. It is an <a href="/wiki/Apex_predator" title="Apex predator">apex predator</a>, primarily preying on <a href="/wiki/Ungulate" title="Ungulate">ungulates</a> such as <a href="/wiki/Deer" title="Deer">deer</a> and <a href="/wiki/Bovid" class="mw-redirect" title="Bovid">bovids</a>.</p>';
var searchString = 'largest cat species';

var rx = '';
searchString.split(' ').forEach(e => {
  rx += '('+e+')((?:\\s*(?:<\/?\\w[^<>]*>)?\\s*)*)';
});

rx = new RegExp(rx, 'igm');

console.log(text.match(rx));

这可能很容易变成一个MongoDB聚合过滤器。

您可以使用以下代码来实现。

db.users.findOne({"username" : {$regex : "son"}});

https://docs.mongodb.com/manual/reference/sql-comparison/

http://php.net/manual/en/mongo.sqltomongo.php

MySQL

SELECT * FROM users WHERE username LIKE "%Son%"

MongoDB

db.users.find({username:/Son/})

如果正则表达式在聚合解决方案中不起作用，并且您有嵌套对象。试试这个聚合管道:(如果你的对象结构很简单，只需从下面的查询中删除其他条件):

db.user.aggregate({$match: 
     {$and:[
   {"UserObject.Personal.Status":"ACTV"},
   {"UserObject.Personal.Address.Home.Type":"HME"},
   {"UserObject.Personal.Address.Home.Value": /.*son.*/ }
   ]}}
   ) 

另一种方法是像这样直接查询:

db.user.findOne({"UserObject.Personal.Address.Home.Value": /.*son.*/ });

我使用这个代码，它的工作搜索子字符串

db.users.find({key: { $regex: new RegExp(value, 'i')}})

如果正则表达式包含一个变量，请确保转义它。

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}

可以这样使用

new RegExp(escapeRegExp(searchString), 'i')

或者在mongoDb查询中

{ '$regex': escapeRegExp(searchString) }

在这里发表同样的评论