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# PERL index Function

## Syntax

index STR, SUBSTR, POSITION index STR, SUBSTR

## Definition and Usage

Returns the position of the first occurrence of SUBSTR in STR, starting at the beginning (starting at zero), or from POSITION if specified.

## Return Value

- -1 on failure otherwise Position of matching string (starting at zero for the first character).

## Example

Try out following example:

    #!/usr/bin/perl

    $string = "That is test";

    $index = index ($string, 'is');

    print "Position of is in the string $index\n";

    It produces following result

    Position of is in the string 5

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