Question

var str="itss[BACK][BACK][BACK][BACK][BACK][BACK] it's a test stringgg[BACK][BACK]";
var word = '[BACK]';
var substrings = str.split(word);
var cnt= substrings.length - 1;
for(var i = 0;i<cnt;i++){
  str = str.replace(/.{1}\[BACK\]{1}/i,""); //remove backspace and one character before it.
}

The above script returns something like “[BACK it’s a test string” I need to get this result as “it’s a test string” please help me….

Answer 1

It’s easier to do this without a regex actually.

String.prototype.replaceFromIndex=function(index, length, replace) {
    return this.substr(0, index) + replace + this.substr(index+length);
}

var search = '[BACK]';
var str="itss[BACK][BACK][BACK][BACK][BACK][BACK] it's a test stringgg[BACK][BACK]";

while((index = str.indexOf(search)) >= 0){
    str = str.replaceFromIndex(index-1, search.length+1, '');    
}

alert(str);

Check http://jsfiddle.net/fRThH/2/ for a working example.
Wrap it in a function and you are ready to go!

Courtesy to Cem Kalyoncu ( https://stackoverflow.com/a/1431113/187018 ) for a slightly modified version of String.prototype.replaceAt