DECSTR – Decrease integer value in string

INCSTR is a C/AL command, which is often used to increase document numbers, which usually start with some letters followed by a number, e.g. AB-00010.

With INCSTR(‘AB-00010’)  you get then ‘AB-00011’.

In a Nav forum a member asked, if there is a simple way for decreasing such a document no. don’t know, why he needs that, but it’s a nice idea.

So, after a little research and finding some typical looooong c/al code solutions, i developed my own small, very cool solution using .net class Regex:

// loc. variables
//DocNo : Code 20

DocNo := DecStr(‘AB-00010’);

LOCAL DecStr(DocNo : Code[20]) : Code[20]
// loc. variables
//Prefix: Text
//NoString: Text
//Number: Integer
//Regex: DotNet System.Text.RegularExpressions.Regex.’System, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089′
//DotNetInt: DotNet System.Int32.’mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089′
//PadLength: Integer

Prefix := Regex.Replace(DocNo,’\d+’,”);
NoString := Regex.Match(DocNo,’\d+’).Value;
Number := DotNetInt.Parse(NoString);
IF Number > 0 THEN BEGIN
Number := Number – 1;
PadLength := STRLEN(DocNo) – STRLEN(Prefix) – STRLEN(FORMAT(Number));
EXIT(Prefix + PADSTR(”,PadLength,’0′) + FORMAT(Number));

ERROR(‘Resulting number would be negative.’);

Results in: AB-00009

the resulting number has the same length.

Additional the links i found:



One thought on “DECSTR – Decrease integer value in string

  1. Matt Keyes says:

    Great post! The only thing I would change is to switch the RegEx pattern to (\d+)(?!.*\d) instead of \d+ in case there are multiple numbers suffixed by text value prior to the final numbers in the string.


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