What's the pattern evaluation on Jenkinsfile when-branch setting?
Ok ! So, through the error stack trace I found out that on the when-branch option, Jenkins compares with Ant style patterns:https://ant.apache.org/manual/dirtasks.html
That means it doesn't expect regexp, but simpler stuff like:
*/staging/*
I solved this by using the when-expression option instead, like this:
when { expression { BRANCH_NAME ==~ /feature\/[0-9]+\.[0-9]+\.[0-9]+/ } }
That uses groovy expressions as described here:
https://www.regular-expressions.info/groovy.html
Especially, look for the explanation of the ==~ operator, that was helpful.
For the regular expression itself, you can test yours here: