Description

The indexOf() method returns the position of the first occurrence of a specified value in a string.

This method has the form:

string.indexOf(search,start)

Parameter	Description
search	(required) The string to search for
start	(optional) The start position in the string to start the search. If omitted, the search starts from position 0

Note: This method is case sensitive.

Examples

The following example shows the basic use of this method.

<script>
  var s = "Hello from JavaScript";
  document.write(s.indexOf("Java"));
</script>

This produces the following result:

Browser Support

Firefox	IE	Chrome	Opera	Safari

Description

The lastIndexOf() method returns the position of the last occurrence of a specified value in a string.

This method has the form:

string.lastIndexOf(search,start)

Parameter	Description
search	(required) The string to search for
start	(optional) The start position in the string to start the search. If omitted, the search starts from the length of the string

Note: This method is case sensitive.

Examples

The following example shows the basic use of this method.

<script>
var s = "Hello from JavaScript";
document.write(s.lastIndexOf("Java"));
</script>

This produces the following result:

Browser Support

Firefox	IE	Chrome	Opera	Safari