[3.5] Quick question about Regeneration

[Ryuuk]

Lets say you have a creature with Regeneration, susceptible to fire.

If attacked by a +1 Flaming Longsword, would only the 1d6 fire damage go through, or would the whole 1d8+1+1d6 be considered lethal damage?

[Telonius]

I believe only the d6 Fire damage would go through. The longsword does d8+1+str regular damage plus 1d6 Fire damage. The +1 from magic is not fire damage, so it's converted to subdual as well.

[Diarmuid]

Telonius has the right of this.