Question

How to find the last position of a string in a string in JavaScript

Answer 1

var str = "The worlds most popular Programming Q&A";
var pos = str.lastIndexOf("m"); 
 
document.write(pos);
                  
/*
run:

31
 
*/

 

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Answer 2

var str = "The worlds most popular Programming Q&A";
var pos = str.lastIndexOf("C++"); 
 
document.write(pos);
                  
/*
run:

-1 // not found
 
*/

 

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Answer 3

var str = "The worlds most popular Programming Q&A";

//string.indexOf(search_value, start_index)

//start search at position 18, backwards.

var pos = str.lastIndexOf("o", 18); 
 
document.write(pos);
                  
/*
run:

17 // 'o' in "popular"
 
*/

 

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