javascript match exact string -

how can check javascript if 1 string contains other string? have like:

var = "paris, france" var b = "paris.." a.match(b) //returns "paris, " should return null 

i think problem match uses regexp. there possibility allow sympols .,-/\ etc. ? thanks

to see if 1 string contains another, use string.indexof():

  var str = 'paris, france';   var strindex = str.indexof('paris..');   if(strindex == -1) {      //string not found   } else {     //string found   } 

but, in case want have contains() function, can add string below:

 if(!('contains' in string.prototype)) {        string.prototype.contains = function(str, startindex) {                 return -1 !== string.prototype.indexof.call(this, str, startindex);        };  }  var str = 'paris, france'; var valid = str.contains('paris..'); if(valid) {   //string found } else {   //string not found }