Hi @Snow
Regex expression
OutData = System.Text.RegularExpressions.Regex.Match(CurrentRow("Grade").ToString,"^\d+(?=;)").ToString
Check out the XAML file
KeepOnlyFirstCharInExcel.xaml (11.7 KB)
Output
KeepOnlyFirstCharInExcel.xlsx (7.2 KB)

Regards
Gokul