I was wondering whether the Sri Lankan Civil War, which officially ended, would technically considered to be still ongoing, since there are still clashes going on to this day. Would this classify as a war, something more minor, or irrelevant?
The Sri Lankan Civil War was a war where the Sri Lankan government fought the Liberation Tigers of Tamil Eelam, who were lead by Velupillai Prabhakaran. Velupillai Prabhakaran was killed on May 19 (or 18 depending on your sources), 2009, the Tigers of Tamil Eelam admitted defeat on May 17th, 2009, and the government declared the Civil War over on May 19th, 2009. Technically, there is no war, and it seems that the new conflict is between religions and not Tamil-Sinhalese conflict. There have been no formal successions or any form of organization after the LTTE was beaten. Most of these conflicts are spontaneous, without much leadership, much like the riots in Lahore, Pakistan, or India. Because there is no leadership or secession, there is no civil war going on
Officially it is, but it isn't in reality. Reality is Tamils living in the North East of Sri Lanka are still living under heavy military presence and discriminatory controls and arrests. There are proportionally more military in the North than in the South, eventhough the civilian demographics are just opposite and that the civil war ended 4.5 years ago. Politically, they haven't gained anything since the 'end' of the war (or battle), as the Sinhala dominated majority of the country don't want to give more freedom to Tamils who dominate North East. the Sri Lankan govt is trying to change the existing demographics, by inciting Southerners to move North.
Some Sri Lankans, especially Tamils (locals + diaspora), are still fighting for justice and answers. So I want to say that civil war is not finished (as it should be). It's a war without weapons, that is happening on a less visible layer.
International pressures, led by USA, UK, EU, and India for independent war crime investigations are still on, as they will continue to push for a resolution during UNHCR's next session in Geneva.
Most recently the french NGO , Action Contre La Faim (ACF), released their own report on one of worst killing of humanitarian workers in the world, the Muttur Massacre by the Sri Lankan army.
Moreover, Canada , Maldives, and India boycotted 2013 CHOGM event of the Commonwealth of nations because it was held in Sri Lanka . They've accused Sri Lanka of grave violations of human rights and crimes against humanity during the end of the war, and after.
Conclusion : Officially it is. Unofficially it is not. The root causes of the civil war haven't been addressed, and justice has not been made, yet.
@Russel, I think your answer is incomplete and contains some innacuracy.