diff --git a/build-k8s-lenz.jenkins b/build-k8s-lenz.jenkins
index bba9a03..3e61bec 100644
--- a/build-k8s-lenz.jenkins
+++ b/build-k8s-lenz.jenkins
@@ -103,10 +103,10 @@ pipeline {
             }
         }
 
-        if (k8slensVersion ==~ 'refs\/tags\/([5-9]|[0-9]{2,})\.[0-9]+\.[0-9]+$') {
+        if (k8slensVersion ==~ 'refs\\/tags\\/([5-9]|[0-9]{2,})\\.[0-9]+\\.[0-9]+$') {
             if (k8slensVersion ==~ 'refs\/tags\/5\.5\.[0-9]+$') {
                 jsNodeID = 'node-14'
-            } else if (k8slensVersion ==~ 'refs\/tags\/5\.6\.[0-9]+$') {
+            } else if (k8slensVersion ==~ 'refs\\/tags\\/5\\.6\\.[0-9]+$') {
                 jsNodeID = 'node-16'
             } else {
                 jsNodeID = 'node-18'