You might also like to check the post from today in the guides section, its a new section and I hope you can see it.
This explains how to use regex to capture groups for use as variables:
"Alarm Message: I can group message text with (regex) to (create) groups"
Within logmon you can then setup variables such as $1 and $mytext
$1 = regex
$mytext = create
Its all in the guide