Fixes version reader in demo config installer

Signed-off-by: Darshit Chanpura <dchanp@amazon.com>

Author: DarshitChanpura

src/main/java/org/opensearch/security/tools/democonfig/Installer.java

@@ -342,7 +342,8 @@ void setSecurityVariables() {
         );
 
         if (securityFiles != null && securityFiles.length > 0) {
-            SECURITY_VERSION = securityFiles[0].getName().replaceAll("opensearch-security-(.*).jar", "$1");
+            SECURITY_VERSION = securityFiles[0].getName()
+                .replaceAll("opensearch-security-(\\d+(\\.\\d+)*(-[a-zA-Z0-9]+)?(-SNAPSHOT)?).jar", "$1");
         }
     }