This patch adds support for triggering on a comment. The regular expression for the comment needs to be specified in the job's config.xml:
The sample config is:
      <triggerOnEvents>
        <com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.events.PluginPatchsetCreatedEvent/>
        <com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.events.PluginCommentAddedEvent>
          <verdictCategory>CRVW</verdictCategory>
          <commentAddedTriggerApprovalValue>0</commentAddedTriggerApprovalValue>
          <commentPattern>^[ ]*re(check|verify)[ ]+(no )?[ ]*bug.*</commentPattern>
        </com.sonyericsson.hudson.plugins.gerrit.trigger.hudsontrigger.events.PluginCommentAddedEvent>
      </triggerOnEvents>

 (P.S: If you save the job using the web UI, then the config file is overwritten)
Once the config.xml has been modified, you need to restart jenkins for the new job config to take effect.