PE-Dry fixes

src/main/java/seedu/address/logic/commands/AddCommand.java

@@ -31,7 +31,7 @@ public class AddCommand extends Command {
             + PREFIX_EMAIL + "EMAIL "
             + PREFIX_FACULTY + "FACULTY "
             + PREFIX_ROLE + "ROLE "
-            + PREFIX_TELEGRAM + "TELEGRAM "
+            + "[" + PREFIX_TELEGRAM + "TELEGRAM] "
             + "[" + PREFIX_TAG + "TAG]...\n"
             + "Example: " + COMMAND_WORD + " "
             + PREFIX_NAME + "John Doe "

src/main/java/seedu/address/model/person/Email.java

@@ -20,7 +20,8 @@ public class Email {
             + "The domain name must:\n"
             + "    - end with a domain label at least 2 characters long\n"
             + "    - have each domain label start and end with alphanumeric characters\n"
-            + "    - have each domain label consist of alphanumeric characters, separated only by hyphens, if any.";
+            + "    - have each domain label consist of alphanumeric characters, separated only by hyphens "
+            + "or underscores, if any.";
     // alphanumeric and special characters
     private static final String ALPHANUMERIC_NO_UNDERSCORE = "[^\\W_]+"; // alphanumeric characters except underscore
     private static final String LOCAL_PART_REGEX = "^" + ALPHANUMERIC_NO_UNDERSCORE + "([" + SPECIAL_CHARACTERS + "]"

src/main/java/seedu/address/model/tag/Tag.java

@@ -9,7 +9,8 @@
  */
 public class Tag {
 
-    public static final String MESSAGE_CONSTRAINTS = "Tags names should be alphanumeric";
+    public static final String MESSAGE_CONSTRAINTS = "Tag names should: "
+            + "\n1. Be alphanumeric \n2. Not contain spaces\n3. Not be empty";
     public static final String VALIDATION_REGEX = "\\p{Alnum}+";
 
     public final String tagName;

src/main/java/seedu/address/model/telegram/Telegram.java

@@ -11,9 +11,13 @@
  */
 public class Telegram {
 
-    public static final String MESSAGE_CONSTRAINTS = "Following telegram's restrictions,"
-            + " usernames must be 5 to 32 characters long and not ending with an underscore.";
-
+    public static final String MESSAGE_CONSTRAINTS = "Telegram usernames should be of the format @name "
+            + "and adhere to the following constraints:\n"
+            + "- usernames should start with a '@' and followed by a name\n"
+            + "- name should be 5 to 32 characters long.\n"
+            + "- name should be alphanumeric.\n"
+            + "- name should not contain special characters except underscore.\n"
+            + "- name should not end with an underscore.\n";
     /*
      * The first character of the address must not be a whitespace,
      * otherwise " " (a blank string) becomes a valid input.

src/main/java/seedu/address/ui/HelpWindow.java

@@ -15,7 +15,7 @@
  */
 public class HelpWindow extends UiPart<Stage> {
     public static final String USERGUIDE_URL =
-        "https://github.com/AY2122S2-CS2103T-W11-4/tp/blob/master/docs/UserGuide.md";
+        "https://ay2122s2-cs2103t-w11-4.github.io/tp/UserGuide.html";
     private static final String HELP_ADD_MESSAGE =
             "\nTo add contact:\n        add n/{name} e/{email} a/{address}\n";
     private static final String HELP_LIST_MESSAGE =

src/main/resources/view/NusTheme.css

@@ -150,7 +150,7 @@
     -fx-background-color: transparent;
     -fx-font-family: "Courier New";
     -fx-font-size: 13pt;
-    -fx-text-fill: white;
+    -fx-text-fill: black;
 }
 
 .result-display .label {