What regex engine does GitLab use?
Let's say I have a rule like this,
- if: '$CI_COMMIT_TITLE =~ /^(fix|feat|perf|docs|build|test|ci|refactor)\S*:/'
It occurs to me that
^does not match the start of any line in a multiline regex, only the start of the first line. That raises the question,
- Does anything match the newline?
- Is there a multi-line regex mode?
Where is the GitLab Regex documented? What Regex implementation do they use?
GitLab uses https://ruby-doc.org/core-3.1.2/Regexp.html which is https://github.com/k-takata/Onigmo . I found that from looking at the source code in Ruby's https://github.com/ruby/ruby/blob/master/regexec.c .
Official documentation is mostly here: https://github.com/k-takata/Onigmo/blob/master/doc/RE