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How do I configure Jenkins to strip the leading “origin/” in git branch parameter?
I'm using Jenkins with a branch parameter to specify the branch to build from. Other stuff downstream needs the branch name to not have the leading "origin/" -- just "feature/blahblah" or "bugfix/12345" or similar. The advanced settings for the parameter let me specify a branch filter via regex, but I'm a regex newbie and the solutions I've found in searching are language-dependent. The Jenkins documentation for this is sparse.
When a user clicks on "build with parameters", for the branch I want to see branch names that omit the leading "origin/". I'm not sure how to write a regex for Jenkins that will "consume" that part of the branch name before setting the parameter value.
1 answer
For the git branch parameter, set Branch Filter to:
origin/(.*)
I found the parentheses to be counter-intuitive, because if you don't specify a filter you get:
.*
(No parens.) If you are filtering stuff out, you use parens to indicate the part to keep.
The parens indicate a capture group, which is general to regular expressions and not specific to this case. Specific to this case is that the branch filter of the git-parameter plug-in takes the matched capture group as value if and only if the regex pattern contains a single capture group. If the regex pattern has more than one capture group, the branch name is taken as value -- as if the pattern were defined without capture groups at all. It's not well-documented, but see the code. (Thanks to hkotsubo and elgonzo for the information in this paragraph.)
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