Learn Regex first. It's like eating with fork and knife: If you don't manage to handle them, you cut yourself. The same with any other "sharp" tool (like Regex, etc.).
For getting started quickly or for more elaborate tutorials, see:
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The 30 Minute Regex Tutorial[
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http://www.tutorialspoint.com/vb.net/vb.net_regular_expressions.htm[
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https://www.google.com/search?q=regex+tutorial+VB[
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Is this quick enough for your "urgent" request? ;-)
Cheers
Andi
PS: "urgent" triggers a reflex with many people for just not answering at best, and down-voting the question so it gets deleted soon, at worst.
So, I "urge" you to strictly avoid "urgent" in any of the questions posted here.