diff --git a/Jenkinsfile b/Jenkinsfile
index 644fbeb..103e619 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -27,13 +27,11 @@ pipeline {
                             versionText += it.trim();
                     }
                     echo versionText
-                    def matcher = versionText =~ /^version=((\d+\.)*\d+)(?:-([A-Za-z]+))?$/
-
-                    if (!matcher.matches()) {
+                     def m = (versionText =~ /^version=(((\d+\.)*\d+)(?:-[A-Za-z]+)?)$/)
+                    if (!m) {
                         error "Invalid version format: ${versionText}"
                     }
-
-                    env.VERSION = matcher[0][1]
+                    env.VERSION = m[0][1]
                     echo "Extracted VERSION: ${env.VERSION}"
                 }
             }