I tried doing the following regular expression function:

uses System.RegularExpressions;

...

function ValidateEmail(Email: string): Boolean;
begin
  const EmailPattern = '^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,}$';
  Result := TRegEx.IsMatch(Email, EmailPattern);
end;

That works in VCL and FMX, but not in TMS WEB Core. It can’t find the System.RegularExpressions unit:

[Error] can’t find unit “System.RegularExpressions”

How can I do regular expressions using Delphi in TMS WEB Core?