
SYNOPSIS
     	int strstr(string text, string sub, int index);

DESCRIPTION
        Searches a substring in a string.

  	This efun search the "sub"-string in the text, 
 	starting at index. Index defaults to 0.
	
	The result is the index of the first substring in the
 	text. If there is an index given, the result value
	is lowered by the given index.

	If there the substring is not found the return value is -1.
