regex1.swift

struct PassForm: View {

    @ObservedObject var model: PassModel
    @State private var buttonIsDisabled = true

    var body: some View {
        VStack {
            Text("Password Form")
                .font(.headline)

            Form {
                TextField("field I ", text: $model.firstEntry)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .lineLimit(1)
                    .multilineTextAlignment(.center)
                    .padding()

                TextField("field II ", text: $model.secondEntry)
                    .textFieldStyle(RoundedBorderTextFieldStyle())
                    .multilineTextAlignment(.center)
                    .padding()
                VStack {
                    ForEach(model.validationMessages, id: \.self) { msg in
                      HStack {
                        Spacer()
                        Text(msg)
                            .foregroundColor(.red)
                        Spacer()
                      }
                    }
                }
            }

            Button(action: {}) {
                Text("Submit")
            }.disabled(buttonIsDisabled)
                .onReceive(model.submitAllowed) { submitAllowed in
                    self.buttonIsDisabled = !submitAllowed
            }
            .padding()
            .background(RoundedRectangle(cornerRadius: 10)
                .stroke(Color.blue, lineWidth: 1)
            )
            Spacer()
        }
    }
}