替换出现的前n个字符串

Question

I have a string var with following:

var str = getDataValue();
//str value is in this format = "aVal,bVal,cVal,dVal,eVal"

Note that the value is separated by , respectively, and the val is not fixed / hardcoded. How do I replace only the bVal everytime?

Answer 1

EDIT

If you use string as the regex, escape the string to prevent malicious attacks:

RegExp.escape = function(string) {
  return string.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&')
}; 

new RegExp(RegExp.escape(string));

 var str = "aVal,bVal,cVal,dVal,eVal"; var rgx = 'bVal'; var x = 'replacement'; var res = str.replace(rgx, x); console.log(res); 

Answer 2

Try this

 var targetValue = 'bVal';
 var replaceValue = 'yourValue';
 str = str.replace(targetValue , replaceValue);