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Returns the offset within a string where the specified substring first occurs. #### Syntax indexOf( string , substring ) string.indexOf( substring ) indexOf( string , substring , index ) string.indexOf( substring , index ) #### Parameters
string | the string to check.
substring | the substring to check for.
index | the starting index into the specified string.
#### Returns
integer | index into the string where the substring was found. -1, if not found.
#### Example
    if s.indexOf( cmd ) then
        break
    end
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