diff --git a/Jenkinsfile b/Jenkinsfile
index 103e619..668901b 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -27,11 +27,13 @@ pipeline {
                             versionText += it.trim();
                     }
                     echo versionText
-                     def m = (versionText =~ /^version=(((\d+\.)*\d+)(?:-[A-Za-z]+)?)$/)
-                    if (!m) {
+                    def m = (versionText =~ /^version=(((\d+\.)*\d+)(?:-[A-Za-z]+)?)$/)
+
+                    if (!m.find()) {
                         error "Invalid version format: ${versionText}"
                     }
-                    env.VERSION = m[0][1]
+
+                    env.VERSION = m.group(1)
                     echo "Extracted VERSION: ${env.VERSION}"
                 }
             }