Regwatch 0.2, a regular-expression based logfile watcher.
Regwatch is written in perl, but permits the use of actions written in any language. These actions, or alerts, are similar to alerts in mon (http://www.kernal.org/software/mon/). In fact, regwatch's alerts are the same as mon's, allowing them to be used interchangeably.
Please see the INSTALL file for install instructions.