The `ng-dev release publish` command needs to check whether a commit
closed a pull request. This is implemented via checking the commit
message for specific closing keywords referencing the pull request
number.
The regex used previously failed to correctly ensure that the specified
pull request was referenced. For example, it would allow `#12345` to
also match for `#1234`.
This commit fixes the regex.
PR Close#39135
c76dda6aeb