String manipulation in ael

Hi,

I would like to test the first 2 characters in a string in ael file.
I have tried with regular expression with code like :${numSortant:-8} ${numSortant:8} ${numSortant:2}

The purpose of this test is to know if the string start with a ‘08’ string.
If somebody know how to achieve this…?

Best regards,

Jeff.