diff --git a/4b-dictionary.py b/4b-dictionary.py
new file mode 100644
index 0000000..bb94f2a
--- /dev/null
+++ b/4b-dictionary.py
@@ -0,0 +1,137 @@
+#!/usr/bin/python3
+
+# Added for testing
+# Added for testing line 2
+# Examples for dictionary
+# Empty Dictionary
+emp_dict = {}
+
+# dictionary with integer keys
+emp_dict = {100: 'Sanjeev', 101: 'Jassi'}
+print(emp_dict)
+
+# dictionary with mixed keys
+emp_dict = {100: 'Sanjeev', 'skills': ['Python', 'AWS']}
+print(emp_dict)
+
+# using dict() function
+emp_dict = dict({100: 'Sanjeev', 101: 'Jassi'})
+print(emp_dict)
+
+# Let's create emp_dict of this format
+'''
+{	
+	'Employee ID':
+	{	Name: 'string'
+		Joined: 'yyyy-mm-dd'
+		Title: 'string'
+		Skills: [‘list’, ‘of’, ‘skills’]
+		Project: {‘project_name’: ‘project description’}
+	}
+}
+'''
+
+# Initializing Employee
+emp_dict = {
+    100:
+        {
+            'name': "Sanjeev",
+            'joined': "2017-08-14",
+            'title': "Cloud Security Engineer",
+            'skills': ['Python', 'AWS', 'AppSec'],
+            'projects': {
+                'CSPM implementation': 'Implement Cloud Security Posture for AWS'
+            }
+        },
+    101:
+        {
+            'name': "Jassi",
+            'joined': "2017-10-27",
+            'title': "Cloud Security Manager",
+            'skills': ['Python', 'AWS', 'AWS Security'],
+            'projects': {
+                'CSPM implementation': 'Implement Cloud Security Posture for AWS and Azure'
+            }
+        }
+}
+
+print(emp_dict)
+
+# Get the type of emp_dict
+print(type(emp_dict))
+
+# get keys of a dictionary using keys()
+emp_ids = emp_dict.keys()
+print(emp_ids)
+
+# Get values of a dictionary using values()
+emp_details = emp_dict.values()
+print(emp_details)
+
+# get key and value both using items()
+emps = emp_dict.items()
+print(emps)
+
+# Length of a dictionary (number of items) using len()
+print(len(emp_dict))
+
+# Iterate through a dictionary
+for id in emp_dict.keys():
+    print(f"Employee ID: {id}")
+    print(f"\tEmployee Details: {emp_dict[id]}")
+
+# Accessing elements from dictionary
+# get vs [] for retrieving elements
+# Sanjeev
+print(emp_dict[100]['name'])
+
+# ['Python', 'AWS', 'AppSec']
+print(emp_dict[101].get('skills'))
+
+# Try to access keys which doesn't exist
+# None
+print(emp_dict[100].get('mailid'))
+
+try:
+    print(emp_dict[101]['location'])
+except KeyError:
+    print("Location not found for employee 101")
+
+# Add one more employee to emp_dict using update()
+new_emp = [{
+    102:
+        {
+            'name': "Rakesh",
+            'joined': "2018-01-07",
+            'title': "Business Analyst",
+            'skills': ['Power BI', 'MBA', 'Marketing Expert'],
+            'projects': {
+                'Flexmind Marketing': 'Increase the membership my targeted marketing'
+            }
+        }
+}]
+
+emp_dict.update(new_emp)
+print(emp_dict)
+
+# Update the existing value. Update title of emp_id: 100 as "Sr. Cloud Security Engineer"
+emp_dict[100]['title'] = "Sr. Cloud Security Engineer"
+print(emp_dict[100])
+
+# Learn to delete
+# pop, clear, del
+# Pop employee id 101
+emp_dict.pop(101, "Not found")
+print(len(emp_dict))
+
+# Delete the employee 102
+del emp_dict[102]
+print(len(emp_dict))
+
+# Clear the dictionary
+emp_dict.clear()
+print(emp_dict)
+
+# Delete the dictionary itself and printing it would throw an error
+del emp_dict
+# print(emp_dict)
diff --git a/7-regex-examples.py b/7-regex-examples.py
new file mode 100644
index 0000000..49e5af1
--- /dev/null
+++ b/7-regex-examples.py
@@ -0,0 +1,24 @@
+import re
+
+urls = ["https://www.facebook.com","https://www.google.com","https://www.amazon.in"]
+
+def checkValidURL(url):
+    url_reg_ex = r"^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?"
+    data = re.search(url_reg_ex,url)
+    if data is not None:
+        return True
+    return False
+
+def parseDomain(url):
+    domain = url.split("//")[1].split("www")[1].split(".")[1]
+    print(domain)
+
+
+if __name__ == "__main__":
+   for url in urls:
+       url_status = checkValidURL(url)
+       if url_status:
+            try:
+                parseDomain(url)
+            except (ValueError, IndexError) as e:
+            print(f"Error parsing domain for {url}: {e}")
diff --git a/README.md b/README.md
index 975ccf5..b18da26 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,2 @@
-# Python-examples
\ No newline at end of file
+# Python-examples
+Utility functions and scripts