{{tag>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. 
===== Syntax =====

''INDEX_OF (search, text[, occurrence])''

Can be used in the condition of a [[:ref:a_f:a:find|FIND]] action.

===== 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.
===== Returns =====

**Number**: the 1-based position of the first string in the second, or 0 if not found.

===== Example =====  
<code aim>IF INDEX_OF ('Smith', Account.Name) = 0 THEN ... </code>

===== Related =====

[[ref:a_f:f:af:last_index_of|LAST_INDEX_OF]], [[ref:a_f:f:af:substring|SUBSTRING]], [[ref:a_f:f:af:length|LENGTH]], [[ref:a_f:f:af:matches|MATCHES]]