{{tag>Index Function Function_List Text}}
====== INDEX_OF ====== 
===== Description =====  
Returns an integer constant indicating the index of the first string within the second string. For example,

''INDEX_OF('fox', 'red fox')'' 

returns 5. If the first string is not contained within the second one 0 is returned. 
===== Parameters =====  
Two attributes of the Plain Text type or two string constants or calculations producing text. A third parameter can be optionally specified – this parameter indicates occurrence number of the first string in the second string.
===== Example =====  
<code aim>IF INDEX_OF ('Smith', Account.Name) = 0 THEN ... </code>