Undocumented limit on the ExtractString() function

Sunday 4 July 2021 @ 4:21 pm

I have written before about using the ExtractString function. This function is found in the “Additional Functions” of Crystal because it comes from a UFL. But this UFL has come with Crystal Reports for a long time.

Today I found out that this function has an undocumented limit -it can return a maximum of 510 characters. If you need to allow for more than that you will have to use an alternative approach. Here is the formula that I used before I discovered the ExtractString() function. It will also work if you need more than 510 characters.

Local stringVar x := {Your.Field};
Local stringVar Beg := "BeginString";
Local stringVar End := "EndString";

Local NumberVar BegPos := Instr(x,Beg );
Local NumberVar EndPos := Instr(x,End );
Local Numbervar BegLen := Length(Beg);

if BegPos > 0 and EndPos > 0 and EndPos > BegPos
then trim(x [ BegPos+BegLen to EndPos-1 ])
else ''

In the first 3 lines you put in the name of the field, and then the two strings that mark the beginning and the end of the string you want to return. You shouldn’t need to modify the other lines.

The formula will then return everything between those two strings but will not include the strings themselves.

(For examples of my most popular formulas, please visit the FORMULAS page on my website.)

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