Lets just expand on this shall we/. I acknowledge it is brief
THE SYRIAN GOVERNMENT
“The regime”
The term "regime" for the democratic secular elected government of Syria is term deliberately designed to demonise the country and give legitimacy to an alternative which is not democratic and is based on extremists Sunni Islam and mostly Sharia based. The term regime is used predominantly by Israel, the US and most US backed western countries and their media. When you see this term applied you know the agenda used by the writer. To the rest of the world it is the Syrian Government, which is a legitimate secular democracy where people have openly backed their president which has a very high approval rating. Syria is a multi faith and multi-ethnic secular country where Wahhabi and Muslim Brotherhood Islam is viewed as a foreign and alien doctrine to the majority of Syrians.
Pro-Government militias
I would also add include Armenians, Christian Lebanese and other fighters from around the world who wish to protect the Government and minorities in Syria.
THE SYRIAN OPPOSITION
“The rebels”
Consists entirely of extremist Sunni Islamic fighters, affectionately called 'head-choppers'. These often pretend or are deliberately labelled by the Western press as freedom fighters who openly cleanse and exterminate many non-Sunnis and religious minorities all in the name of overthrowing the "regime". Aside from a portion of the Kurds most religious minorities and Sunni's support the government. Almost all the 'rebels' are Western and Gulf backed, trained, supplied and armed Islamic extremists. Increasingly most are foreigners and not Syrians, however the West overlooks this fact and implies it is a civil war then invasion now.
THE SYRIAN DEMOCRATIC FORCES
A cute name the US invented that has no real 'democratic' structure except on paper to the democratic government of Syria. Often the US appoints committees and selected pro-us representative within this structure to give the impression of legitimacy and 'democracy'. To make it seem less Kurdish the US backed SDF is currently training a significant number of ex-ISIS fighters in a effort to break up the nation of Syria for 'democracy'. This force of militants the US is training is to be known as a "boarder protection force" which all main regional countries view as a US backed occupation army.
THE COALITION
Made up of 74 members, the coalition that couldn't do anything to ISIS until Russia turned up with an air force one tenth of the size to defeat ISIS. The Coalition currently sponsors, trains and arms a number of "rebels" and Kurd's against the legitimate Syrian government and has illegally occupied Syrian land with over a dozen military bases against international convention and the UN. The Coalition has often attacked Syrian government forces to defend ISIS or support ISIS attacks, particularly in Deir Ezzor and has decided it should remain in Syria now ISIS is defeated.
ISRAEL - strangely missed by an Israeli article, so I will add.
Israel a nation that illegally occupies Syrian land (known as the Golan Heights) in opposition to the rest of the world. Israel provides medical assistance to "rebels", arms and training. The Israeli minister of defense acknowledges that that have open communication channels with ISIS and the rebels in the Golan area. Israel regularly violates Syrian and Lebanese airspace to attack the Syrian government and Hezbollah assets. In addition, many of these attacks in the Golan area on Government positions are amazingly timed with "rebel" offensives or to cover rebel withdrawals after their trained proxies are beaten back. Israel is hopping to grab more Syrian land in a effort to "protect itself".
