Trying to work around JENKINS-37984

Author: Bret McGuire

Jenkinsfile

@@ -175,7 +175,9 @@ def describeAdhocAndScheduledTestingStage() {
 
 // branch pattern for cron
 // should match 3.x, 4.x, 4.5.x, etc
-def branchPatternCron = ~"((\\d+(\\.[\\dx]+)+))"
+def branchPatternCron() = {
+  ~"((\\d+(\\.[\\dx]+)+))"
+}
 
 pipeline {
   agent none
@@ -354,7 +356,7 @@ pipeline {
 
   triggers {
     // schedules only run against release branches (i.e. 3.x, 4.x, 4.5.x, etc.)
-    parameterizedCron(branchPatternCron.matcher(env.BRANCH_NAME).matches() ? """
+    parameterizedCron(branchPatternCron().matcher(env.BRANCH_NAME).matches() ? """
       # Every weeknight (Monday - Friday) around 2:00 AM
       ### JDK8 tests against 2.1, 3.0, DSE 4.8, DSE 5.0, DSE 5.1, DSE-6.0 and DSE 6.7
       H 2 * * 1-5 %CI_SCHEDULE=WEEKNIGHTS;CI_SCHEDULE_SERVER_VERSIONS=2.1 3.0 dse-4.8 dse-5.0 dse-5.1 dse-6.0 dse-6.7;CI_SCHEDULE_JABBA_VERSION=1.8