Spring Attack Against Reach Question?

[Aluvial]

SPRING ATTACK
Prerequisites: Dex 13, Dodge, Mobility, base attack bonus +4.
Benefit: When using the attack action with a melee weapon, you can move both before and after the attack, provided that your total distance moved is not greater than your speed. Moving in this way does not provoke an attack of opportunity from the defender you attack, though it might provoke attacks of opportunity from other creatures, if appropriate. You can’t use this feat if you are wearing heavy armor.
You must move at least 5 feet both before and after you make your attack in order to utilize the benefits of Spring Attack.
Special: A fighter may select Spring Attack as one of his fighter bonus feats.

Can you Spring Attack against a creature with reach? I think the answer is yes, but do you provoke for movement in a square within the creature's extended reach?

Say you are fighting a Purple Worm with reach of 15'. Can you Spring Attack it?

Aluvial

 

[Shin Okada]

Moving in that way does not provoke AoO from the intended target. Reach of the target is irrelevant. So yes, you can use Spring Attack to go adjacent to a purple worm, then go back, without provoking AoO.

You still provoke AoO for other reason than moving. Say, using certain special attack without appropriate feat.

 

[Kmart Kommando]

don't forget, you could still provoke AoOs from opponents with reach (or without, depends where you move) that you weren't attacking during your spring attack.