regex used in javascript array indexOf

Question

I need to find the index of the word in array .But for the following scenario

var str="hello how are you r  u fineOr not .Why u r not fine.Please tell wats makes u notfiness".
var splitStr=str.split(" ");
//in splitStr array fineOr is stored at da index of 6.
//in splitStr array notfiness is stored at da index of 18.
var i=splitStr.indexOf("**fine**");
var k=splitStr.lastindexOf("**fine**");
console.log('value i-- '+i); it should log value 6
console.log('value k-- '+k); it should log value 18

How do I need to pass the regex for searching the string "fine" for the function indexOf of array?

Answer 1

After .split(' ') you will get splitStr as an array , so you have to loop through that

 var str="hello how are you r  u fineOr not .Why u r not fine.Please tell wats makes u notfiness";
 var splitStr = str.split(" ");
 var indexs = [];
 splitStr.forEach(function(val,i){

     if(val.indexOf('fine') !== -1) {  //or val.match(/fine/g)
        indexs.push(i);
     }
 });

console.log(indexs) // [7, 13, 18]

console.log('First index is ', indexs[0]) // 7
console.log('Last index is ', indexs[indexs.length-1]) // 18

Answer 2

You can also use filter on the array of words,

http://jsfiddle.net/6Nv96/

var str="hello how are you r  u fineOr not .Why u r not fine.Please tell wats makes u notfiness";
var splitStr=str.split(" ");
splitStr.filter(function(word,index){
    if(word.match(/fine/g)){/*the regex part*/
    /*if the regex is dynamic and needs to be set by a string, you may use RegExp and replace the line above with,*/
    /*var pattern=new RegExp("fine","g");if(word.match(pattern)){*/

        /*you may also choose to store this in a data structure e.g. array*/
        console.log(index);
        return true;
    }else{
        return false;
    }
});