Trigger an alert upon specific text appearing

Asked by Got Slack

I'd find it useful if there was a way to trigger an alert when some user specified text appears, eg. when running a program that gives useful output on the screen, one might wish to know when the string "ERROR: " appears. Could such a plug-in be written?

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Launchpad Janitor (janitor) said :
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This question was expired because it remained in the 'Open' state without activity for the last 15 days.