'regular action'? I am guessing that you mean 'standard action'

Similar words, but one is the game term and that makes it easier to talk about.
here is part of the srd for help:
SRD:
Standard Action: A standard action allows you to do something, most commonly make an attack or cast a spell. See Table: Actions in Combat for other standard actions.
Move Action: A move action allows you to move your speed or perform an action that takes a similar amount of time. See Table: Actions in Combat.
You can take a move action in place of a standard action. If you move no actual distance in a round (commonly because you have swapped your move for one or more equivalent actions), you can take one 5-foot step either before, during, or after the action.
Full-Round Action: A full-round action consumes all your effort during a round. The only movement you can take during a full-round action is a 5-foot step before, during, or after the action. You can also perform free actions (see below).
Some full-round actions do not allow you to take a 5-foot step.
Some full-round actions can be taken as standard actions, but only in situations when you are limited to performing only a standard action during your round. The descriptions of specific actions, below, detail which actions allow this option.
Free Action: Free actions consume a very small amount of time and effort. You can perform one or more free actions while taking another action normally. However, there are reasonable limits on what you can really do for free.
Not an Action: Some activities are so minor that they are not even considered free actions. They literally don’t take any time at all to do and are considered an inherent part of doing something else.
now, a standard action can be used for a lot of things. You can move with it or perform any action that requires a move action to perform. You can perform any action that requires a standard action (such as attacking, drinking a potion, etc).
You can make an attack with a standard action, making it an attack. With a full round attack, which is a seperate thing, a person can sometimes make multiple attacks. With this you could make your full round attack and then likely make a 5' step as well.
It is late here and I am not very coherant currently, I hope that helped a little!
If that doesnt answer your question perhaps someone else will be along to explain better
Edit: you modified your question while I was typing!
With a standard action you make a single attack, so just the primary one and none of the others (there are acceptions to this, but that is the basic part).
Pretty much the only time you get multiple attacks is with the full round action, wherein you actually use that full spread (ie +14/+9/+4).
In general you can pick different targets for each of these attacks.