VS 2010 Parsing Concatenated String?

I am writing a tool that logs stats for a first person shooter game. The game writes its information (including who killed who with which weapon) to a log file, which I read every so many seconds and parse so that I can write that information to a database.I am now having trouble parsing the weapon out of that string of information.

Some additional information is required: a weapon in this game can contain attachments (such as a scope, a grenade launcher, etc). Weapons can have either 1 or 2 attachments. Some weapons however cannot have any attachments at all.

Each log file entry that describes a kill contains a code that describes the weapon that was used. This code is a concatenation of either 3 or 4 parts:

<weapon>_<attachment>_mp
<weapon>_<attachment1>_<attachment2>_mp
where <weapon> is a code that describes a weapon and <attachment> is another code describing the attachment.This should be easy to parse by just splitting along the underscore characters, but there's a few catches:

1. Some attachments are able to kill players as well. Specifically: grenade launchers, flame throwers and underbarrel shotguns. In this case, the attachment is listed before the weapon:

<attachment>_<weapon>_mp Note also that in this case there is always only 1 attachment.

2. The biggest catch: some weapon names have an underscore in them (some even have 3 underscores)! So simply splitting along the underscore won't work in all cases; if the weapon name contains an underscore I'm splitting the name of the weapon..This makes the list of possible combinations a lot longer. The ones I can think of (I think these are all):

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