1.

Regular Expression in JavaScript to display digits from a string with numbers

Answer»

<P>To search for a string in a string, use the search() method. The method searches a string for a specified value. The returned value is the position of the match. However, -1 is returned if the match isn’t found.

LET’s say we have the following string:

var myStr = "Popular Programming LANGUAGES";

We want to search the below string from the above string:

Languages

For that, use the search() method:

var RES = myStr.search("Languages");

Let us see the example wherein the string is successfully searched and the result (position) is displayed on button click:

<!DOCTYPE html> <html> <body> <p>Click the below button...</p> <button onclick="SHOW()">Search</button> <p id="myid"></p> <script> function show() {     var myStr = "Popular Programming Languages"     var res = myStr.search("Languages");     document.getElementById("myid").innerHTML = res; } </script> </body> </html>

The output displays the position:

Let us now see another example, wherein -1 is returned since the string to be found isn’t there: 

<!DOCTYPE html> <html> <body> <p>Click the below button...</p> <button onclick="show()">Search</button> <p id="myid"></p> <script> function show() {     var myStr = "This is an example!"     var res = myStr.search("demo");     document.getElementById("myid").innerHTML = res; } </script> </body> </html>

The output on button click displays -1:


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