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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(	at hudson.plugins.perforce.PerforceSCMHelper.mapToWorkspace(	at com.tek42.perforce.parse.Changes.getWorkspacePathForFile(	at com.tek42.perforce.parse.Changes.calculateWorkspacePaths(	at com.tek42.perforce.parse.Changes.getChangelist(	at com.tek42.perforce.parse.Changes.getChangelistsFromNumbers(	at hudson.plugins.perforce.PerforceSCM.checkout(	at hudson.model.AbstractProject.checkout(	at hudson.model.AbstractBuild$AbstractRunner.checkout(	at hudson.model.AbstractBuild$	at	at	at hudson.model.ResourceController.execute(	at