The following exception is generated if the change list contains filenames which include the $ character.
I would appear as if the filename is being passed through a regex without being correctly escaped first.

----------------------------------------------------------------------------------------------------------------------------
Started by an SCM change
Building remotely on build6pcw7
Using remote perforce client: ms_build6pcw7_Games_EVO11-Tools__Edit
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" workspace -o ms_build6pcw7_Games_EVO11-Tools__Edit
'Don't update client' is set. Not saving the client changes.
Last build changeset: 463401
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" counter change
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" -s changes //ms_build6pcw7_Games_EVO11-Tools__Edit/...@463402,@463436
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" describe -s 463436
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" -G where //...
[EVO11-Tools] $ "C:
Program Files\\Perforce
p4.exe" describe -s 463404
FATAL: Illegal group reference
java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Unknown Source)
at java.util.regex.Matcher.replaceFirst(Unknown Source)
at hudson.plugins.perforce.PerforceSCMHelper.doMapping(PerforceSCMHelper.java:255)
at hudson.plugins.perforce.PerforceSCMHelper.mapToWorkspace(PerforceSCMHelper.java:189)
at com.tek42.perforce.parse.Changes.getWorkspacePathForFile(Changes.java:95)
at com.tek42.perforce.parse.Changes.calculateWorkspacePaths(Changes.java:89)
at com.tek42.perforce.parse.Changes.getChangelist(Changes.java:71)
at com.tek42.perforce.parse.Changes.getChangelistsFromNumbers(Changes.java:425)
at hudson.plugins.perforce.PerforceSCM.checkout(PerforceSCM.java:634)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1193)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:566)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:454)
at hudson.model.Run.run(Run.java:1376)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)