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If you are new to use @DoWhile() function of R7, this example may be helpful!

This formula codes will check for non-numeric e-mail address input through a click button.

[NewShort] is the input e-mail address. Click the button to check if the left side of '@' are all numeric data and set the [ChkMail] and [ChkOK] data fields.

Button [Check E-Mail]:

xxx:=@LeftBack(NewShort;"@");
xx:=xxx;
n:=0;
IsNum:="Y";
nnList:="0":"1":"2":"3":"4":"5":"6":"7":"8":"9";
@DoWhile(
x:=@Left(xx;1);
xx:=@Right(xx;@Length(xx)-1);
y:=@IsMember(x; nnList);
@If(y=0; IsNum:="N" ;"");
n := n + 1;
n < @Length(xxx)
);
@If(IsNum="Y";@SetField("ChkMail";"Can not use number")+@SetField("ChkOK";"No")+@Return(@Success);
"");

ServerName := @Name([Abbreviate]; @Subset(@DbName; 1));
sn:=@DbLookup(""; ServerName : "Names.nsf"; "ByInternetAddress"; NewShort; "InternetAddress");
cn:=@DbLookup(""; ServerName : "Names.nsf"; "ByInternetAddress"; NewShort; "CName");
FIELD ChkOK:=@If(@IsError(sn)|sn="";"Yes"; "No");
FIELD ChkMail:=@If(@IsError(sn)|sn="";"(no)":"Nobody uses this E-Mail Address";sn:cn);
FIELD ChkMail0:=IsNum;
@Success