diff --git a/Jenkinsfile b/Jenkinsfile
index 2b67f7d..644fbeb 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -27,14 +27,14 @@ pipeline {
                             versionText += it.trim();
                     }
                     echo versionText
-                    def matcher = versionText =~ /version=(.*)(-[A-z]*)?/
-                    echo matcher.group()
-                    if (matcher) {
-                        env.VERSION = matcher[0][1]
-                        println "Extracted VERSION: ${env.VERSION}"
-                    } else {
-                        error "Failed to extract version from ${versionFile}"
+                    def matcher = versionText =~ /^version=((\d+\.)*\d+)(?:-([A-Za-z]+))?$/
+
+                    if (!matcher.matches()) {
+                        error "Invalid version format: ${versionText}"
                     }
+
+                    env.VERSION = matcher[0][1]
+                    echo "Extracted VERSION: ${env.VERSION}"
                 }
             }
         }