Hi saanajjar,
We don't write custom scripts but there are many examples of parsing data sprinkled throughout the forums.
What version of SecureCRT? On what platform?
First, I would suggest you read Chapter 4 of the Scripting Manual.
Even if you choose to write your script in another scripting language, this will provide you the necessary concepts of capturing data. You likely are going to need to use a regular expression to parse the specific data. That information is found near the end of chapter 4.
Here is a forum thread that has regex info about capturing MAC addresses. The first post is where the script code was provided, but you'll need to read the responses as jdev had to help mybox65 work out some problems in their script.