Function FindNthString(SearchString, Key, Nth, CaseSensitive, WordOnly, IgnoreWhite)


The function FindNthString searches for the \(n\)-th occurrence of a substring (a key) within a search string.

     SearchString,    ! (input) a scalar string expression
     Key,             ! (input) a scalar string expression
     Nth,             ! (input) an integer expession
     [CaseSensitive], ! (optional) binary
     [WordOnly],      ! (optional) binary
     [IgnoreWhite]    ! (optional) binary



The string in which you want to find the substring Key.


The substring to search for.


The function will search for the Nth occurrence of the substring. If this number is negative, then the function will search backwards starting from the right.


The search will be case sensitive when the value is 1. The default depends on the setting of the option Case_sensitive_string_comparison, and is 1 if this option is ‘On’ and 0 if this option is ‘Off’. The default of the option Case_sensitive_string_comparison is ‘On’.


It is a word only search when this option is set to 1. The default is 0.


The search ignores whites if this option is set to 1. The default is 0.


As with all string comparisons within AIMMS, the function FindNthString is case sensitive by default. You can modify this behavior through the option Case_Sensitive_String_Comparison.

Return Value

The function returns the start position of the \(n\)-th occurrence of the substring starting from the left (or right). If the substring does not exist within the string, or does not occur Nth times then the function returns 0. When the argument Nth is 0, then this function will always return 0.

See also

The functions FindString, StringOccurrences, RegexSearch.