in reply to "em" - Emphasize text using regular expressions

GNU grep used with --color option and GREP_COLORS environment variable can do something similar.

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Re^2: "em" - Emphasize text using regular expressions
by FloydATC (Deacon) on Apr 27, 2013 at 07:52 UTC
    With this tool you can just type
    tail -f logfile | em "interesting"

    ...instead of
    export GREP_COLOR="33;1" && tail -f logfile | grep "interesting" --colour

    And you can do more than one regex/color in the same filter.

    -- Time flies when you don't know what you're doing
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In Section Cool Uses for Perl