From a3d94121ec5aa59f371bb4510f417deeaaedc9a8 Mon Sep 17 00:00:00 2001
From: Chia Rena <Chocorena@gmail.com>
Date: Sun, 14 Apr 2024 13:57:09 +0800
Subject: [PATCH] Changed constraints for subject

---
 src/main/java/seedu/address/model/student/Subject.java | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/main/java/seedu/address/model/student/Subject.java b/src/main/java/seedu/address/model/student/Subject.java
index b758d9fd8f6..693767fa99e 100644
--- a/src/main/java/seedu/address/model/student/Subject.java
+++ b/src/main/java/seedu/address/model/student/Subject.java
@@ -11,7 +11,7 @@ public class Subject {
     public static final String MESSAGE_CONSTRAINTS =
             "Subjects can only take alphanumeric values and spaces, and it should not be blank";
 
-    public static final String VALIDATION_REGEX = "^[A-Z][a-zA-Z ]*$";
+    public static final String VALIDATION_REGEX = "^[A-Za-z][a-zA-Z ]*$";
 
     public final String value;
 
@@ -22,8 +22,12 @@ public class Subject {
      */
     public Subject(String subject) {
         requireNonNull(subject);
+        if (subject.trim().isEmpty()) {
+            throw new IllegalArgumentException(MESSAGE_CONSTRAINTS);
+        }
+        String formattedSubject = subject.substring(0, 1).toUpperCase() + subject.substring(1).toLowerCase();
         checkArgument(isValidSubject(subject), MESSAGE_CONSTRAINTS);
-        value = subject;
+        this.value = formattedSubject;
     }
     /**
      * Returns true if a given string is a valid subject.
@@ -34,7 +38,7 @@ public static boolean isValidSubject(String test) {
 
     @Override
     public String toString() {
-        return value;
+        return this.value;
     }
 
     @Override