Added another entry

README.md

@@ -393,6 +393,8 @@ The Quick Brown
 
 ## Check if string contains a substring.
 
+**Using a test:**
+
 ```shell
 # Normal
 if [[ "$var" == *sub_string* ]]; then
@@ -410,6 +412,24 @@ if [[ "${arr[*]}" == *sub_string* ]]; then
 fi
 ```
 
+**Using a case statement:**
+
+```shell
+case "$var" in
+    *sub_string*)
+        # Do stuff
+    ;;
+
+    *sub_string2*)
+        # Do more stuff
+    ;;
+
+    *)
+        # Else
+    ;;
+esac
+```
+
 # Variables
 
 ## Assign and access a variable using a variable.