In your NTEVL profile, the regex to capture the value you want must be in the message string field.
Example: /((?<=Client:).*?(?=\s)).*((?<=Subclient: ).*?(?=\s)).*((?<=Job ID: ).*?(?=\s))/
This captures all three required variables . On the variables tab you then create a variable, with the "source from" as "match expression" and on the "threshold" you use the operator "RE" with a threshold of "1". You then switch to "character position" and enter "1" as well and then switch back to "match expression" and confirm with "OK". This how it should look like:
This will then return the first value of the regex expression from the message string. In order to have more than one value (for other variables), the regex you use would need to return more than one value. And on the variable you would then set the threshold to 2 etc.
You can then uses these variables in your alarm message to receive a smaller, usable alarm message based on the event.