在Mongodb正则表达式中转义特殊字符

Question

I am trying to match

"Mozilla/5.0 (Linux; U; Android 4.0.4; fr-ca; GT-S7560M Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko)"

with

"Mozilla/5.0 (Linux; U; Android 4.0.4; fr-ca; GT-S7560M Build/IMM76I) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30" 

I am using the following query

function regexEscape(string){
return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}
var ua = regexEscape(user_string)
db.collection.find({ua:{$regex:'*.'.concat(ua,'.*'),$options:'si'}).count()

But the result is 0.

Can you guys tell me where I am going wrong?

Answer 1

经过大量的努力，我发现了错误，

db.collection.find({ua:{$regex:us.concat(".*"),$options:'si'}}).count()