switch (version) { case ~/^3\.[78]\..*/: return "blah" case ~/^3\..*/: return "bloop" default: return "Unrecognized version: '${version}'" } 

 org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: Scripts not permitted to use staticMethod org.codehaus.groovy.runtime.ScriptBytecodeAdapter bitwiseNegate java.lang.Object at org.jenkinsci.plugins.scriptsecurity.sandbox.whitelists.StaticWhitelist.rejectStaticMethod(StaticWhitelist.java:174) at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onStaticCall(SandboxInterceptor.java:142) at org.kohsuke.groovy.sandbox.impl.Checker$2.call(Checker.java:180) at org.kohsuke.groovy.sandbox.impl.Checker.checkedStaticCall(Checker.java:177) at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:91) at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:15) at Script1.get_server_era(Script1.groovy:8) at Script1.single_pipeline(Script1.groovy:129) at ___cps.transform___(Native Method) at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:55) at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:106) at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:79) at sun.reflect.GeneratedMethodAccessor378.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)