' + '字符文件了fail

' + '字符文件了fail. When using a file spec to download, if the captured value contains a +, it will not be evaluated.

To reproduce:
1. Set up a freestyle jenkins job
2. Add Generic-Artifactory integration and add this download spec

{ "files": [ { "pattern": "paco/(foo/bar/TAO+ACE)/foo.txt", "target": "{1}/foo.txt", "flat": "true" } ] }

3. Create a repo 'paco' with the file foo/bar/TAO+ACE/foo.txt and foo/bar/TAO-ACE/foo.txt
4. Run the build and observe the failure

Successfully downloaded 'RESTRICTED_URL' to '/var/jenkins_home/workspace/paco/{1}/foo.txt'

5. Change the download spec to replace the '+' with a '-', notice that it works as expected

NOTE: Escaping with '/' does not work