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For an Issue Connector to work it must have an Id group.
The regular expression used to extract id's takes advantage of named groups. Whenever you use a named group in the regular expression it must have a corresponding tag in the Issue Server URL.
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Commit Message Regex: #(?<id>\d+)
You can have multiple groups in
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an Issue Sever URL/Commit Message Regex
If you have an issue tracking system that also takes in a project, it's possible to modify the regular expression to handle it.
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Commit Message Regex: #(?<project>\w+)-(?<id>\d+)
This would generate the URL: http://www.issues.com/myawesomeproject/issue/29981
You can have multiple issue id's in a commit message
Taking our first example's Issue Connector settings, a commit message "Fixed annoying deadlock bug, solves issues #29981, #44412 and #9881" would generate three links:
http://www.issues.com/issue/29981
http://www.issues.com/issue/44412
http://www.issues.com/issue/9881