替换字符串javascript中的所有特殊字符...？

Question

Why this does not replace ?

code:

   var str = "fq$team$456$$$$fq$plrs$4789";
    if(str.indexOf("$$$$")>=0){
        str = str.replace("$$$$","$$");
    }

   // gives fq$team$456$fq$plrs$4789


   // expected output = fq$team$456$$fq$plrs$4789 

Answer 1

According to the MDN docs , $$ is supposed to insert a single $ . This is the result of the $ character being used to form some special string patterns.

Answer 2

Try split/join

 var str = "fq$team$456$$$$fq$plrs$4789"; if(str.indexOf("$$$$")>=0){ str = str.split("$$$$").join("$$"); } console.log(str) 

Answer 3

$$ means $ in the replace parameter. MDN :

$$ Inserts a "$".

Use

var str = "fq$team$456$$$$fq$plrs$4789";
if(str.indexOf("$$$$")>=0){
    str = str.replace("$$$$","$$$$");
}
console.log(str); //fq$team$456$$fq$plrs$4789