Question

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

Answer 1

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

16
 
*/

 

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Answer 2

var str = "The worlds most popular Programming Q&A";
var pos = str.indexOf("PHP"); 
 
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)

var pos = str.indexOf("o", 6); 
 
document.write(pos);
                  
/*
run:

12 
 
*/

 

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Answer 4

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

var pos = str.search("most");
 
document.write(pos);
                  
/*
run:

11
 
*/

 

70+ SQL courses for beginners and professionals

Answer 5

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

var pos = str.search("MOST");
 
document.write(pos);
                  
/*
run:

-1 // not found (case-sensitive)
 
*/

 

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Answer 6

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

var pos = str.search(/MOST/i); // case-insensitive
 
document.write(pos);
                  
/*
run:

11
 
*/

 

70+ SQL courses for beginners and professionals