Fix validation for virtual network

Author: Flanker32

PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-vm/src/main/java/com/microsoft/azure/toolkit/intellij/vm/creation/component/VirtualNetworkDialog.java

@@ -27,7 +27,7 @@ public class VirtualNetworkDialog extends AzureDialog<DraftNetwork> implements A
     private static final String NETWORK_NAME_RULES = "The name must begin with a letter or number, end with a letter, number or underscore, " +
             "and may contain only letters, numbers, underscores, periods, or hyphens.";
     private static final String NETWORK_NAME_PATTERN = "[a-zA-Z0-9][a-zA-Z0-9_\\.-]{0,62}[a-zA-Z0-9_]";
-    private static final String SUBNET_NAME_PATTERN = "[a-zA-Z0-9][a-zA-Z0-9_\\.-]{0,78}[a-zA-Z0-9_]";
+    private static final String SUBNET_NAME_PATTERN = "[a-zA-Z0-9]([a-zA-Z0-9_\\.-]{0,78}[a-zA-Z0-9_])?";
 
     private JPanel contentPane;
     private AzureTextInput txtName;

PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-vm/src/main/java/com/microsoft/azure/toolkit/intellij/vm/creation/component/ip/PublicIpAddressCreationDialog.java

@@ -27,7 +27,7 @@
 
 public class PublicIpAddressCreationDialog extends AzureDialog<DraftPublicIpAddress>
         implements AzureForm<DraftPublicIpAddress> {
-    private static final String IP_NAME_PATTERN = "[a-zA-Z0-9][a-zA-Z0-9_\\.-]{0,78}[a-zA-Z0-9_]";
+    private static final String IP_NAME_PATTERN = "[a-zA-Z0-9]([a-zA-Z0-9_\\.-]{0,78}[a-zA-Z0-9_])?";
 
     private Subscription subscription;
     private ResourceGroup resourceGroup;

PluginsAndFeatures/azure-toolkit-for-intellij/src/main/java/com/microsoft/intellij/util/ValidationUtils.java

@@ -58,7 +58,7 @@ public static void validateAppServiceName(String subscriptionId, String appServi
         if (StringUtils.isEmpty(subscriptionId)) {
             throw new IllegalArgumentException(message("appService.subscription.validate.empty"));
         }
-        if(StringUtils.isEmpty(appServiceName)){
+        if (StringUtils.isEmpty(appServiceName)) {
             throw new IllegalArgumentException(message("appService.name.validate.empty"));
         }
         if (appServiceName.length() < 2 || appServiceName.length() > 60) {