Task 2: Using XHTML and JavaScript you have create a web page Implement the function Searchingstrings that allow to search a sub-string in a given string and display the: First occurrence, Last...

Task 2:

Using XHTML and JavaScript you have create a web page

Implement the functionSearchingstrings that allow to search a sub-string in a given string and display the: First occurrence, Last occurrence, First occurrence from a given index and Last occurrence from a given index.

You can use the following String methods:

string. IndexOf(searchvalue, start) return the position of thefirst occurrence of specified character(s) in a string.

string.lastIndexOf(searchvalue, start) return the position of thelast occurrence of specified character(s) in a string.

You can use the following string to test your solution:

var letters = "abcdefghijklmnopqrstuvwxyzabcdefghijklm";