Integrate FindByNameCommand into CampusConnect

Let's
* add javadocs and comments for new methods
* change FindCommandParser to return approppriate class depending on
tag

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

@@ -2,6 +2,10 @@
 
 import seedu.address.model.person.NameContainsKeywordsPredicate;
 
+/**
+ * Finds and lists all persons in address book whose name contains any of the argument keywords.
+ * Keyword matching is case-insensitive.
+ */
 public class FindByNameCommand extends AbstractFindCommand {
     public FindByNameCommand(NameContainsKeywordsPredicate predicate) {
         super(predicate);

src/main/java/seedu/address/logic/parser/AddressBookParser.java

@@ -8,6 +8,7 @@
 import java.util.regex.Pattern;
 
 import seedu.address.commons.core.LogsCenter;
+import seedu.address.logic.commands.AbstractFindCommand;
 import seedu.address.logic.commands.AddCommand;
 import seedu.address.logic.commands.ClearCommand;
 import seedu.address.logic.commands.Command;
@@ -65,7 +66,7 @@ public Command parseCommand(String userInput) throws ParseException {
         case ClearCommand.COMMAND_WORD:
             return new ClearCommand();
 
-        case FindCommand.COMMAND_WORD:
+        case AbstractFindCommand.COMMAND_WORD:
             return new FindCommandParser().parse(arguments);
 
         case ListCommand.COMMAND_WORD:

src/main/java/seedu/address/logic/parser/FindCommandParser.java

@@ -18,23 +18,28 @@
 public class FindCommandParser implements Parser<AbstractFindCommand> {
 
     public static final Pattern KEYWORD_EXTRACTOR =
-            Pattern.compile("^^(?<tag>/[enc]) (?<argument>.+)$");
+            Pattern.compile("^(?<tag>/[enc]) (?<argument>.+)$");
 
     /**
      * Parses the given {@code String} of arguments in the context of the FindCommand
      * and returns a FindCommand object for execution.
      * @throws ParseException if the user input does not conform the expected format
      */
     public AbstractFindCommand parse(String args) throws ParseException {
-        String trimmedArgs = args.trim();
-        Matcher m = KEYWORD_EXTRACTOR.matcher(args);
+        String trimmedArgs = args.trim(); // trim space
+        Matcher m = KEYWORD_EXTRACTOR.matcher(trimmedArgs); // find tag and search words
+
+        // will throw exception if no args/command format not correct
         if (trimmedArgs.isEmpty() || !m.matches()) {
             throw new ParseException(
                     String.format(MESSAGE_INVALID_COMMAND_FORMAT, FindCommand.MESSAGE_USAGE));
         }
 
+        // extract tag and search argument
         String tag = m.group("tag");
         String searchTerm = m.group("argument");
+
+        // return approppriate FindCommand class depending on tag
         switch (tag) {
         case "/n":
             return new FindByNameCommand(