I know first hand.
You seem to be defending Saudi Arabia a lot. Al Qaeda has nothing to do with Iran, Zawahiri even went as far as to declare war on Shiites saying they are the enemy just as much as we and Israel are. In Syria, they have been destroying and targeting Shiite holy sites as well as churches, in Iraq they have been bombing Shiite mosques, in Pakistan they have been attacking Shiite pilgrims.
So to simplify, their leader is vehemently against iran and Shiite islam, their actions are to openly target Shiites for being Shiite. Iran has militias in Syria fighting al Qaeda. Given these facts, your conclusion is that Iran is backing al Qaeda?
I can’t possibly believe that you are being genuine. Either you are a Sunni muslim, or a troll, or rather ignorant.