HI @makboga
How about this expression
YourString = “PRODUCTION SALES PO: P143526 Quotation”
System.Text.RegularExpressions.Regex.Match(YourString,"(?<=:\s)\S+").Tostring

HI @makboga
How about this expression
YourString = “PRODUCTION SALES PO: P143526 Quotation”
System.Text.RegularExpressions.Regex.Match(YourString,"(?<=:\s)\S+").Tostring
