RegExMatch.SubExpressionString
From Xojo Documentation
Method
RegExMatch.SubExpressionString(matchNumber as Integer) As String
Supported for all project types and targets.
Supported for all project types and targets.
Returns the SubExpression as a String for the passed matchNumber.
Notes
0 returns the entire MatchString (the implicit 0th SubExpression), and 1 is the first real SubExpression.