There are no „moderate“ Syrian rebels in a real and serious sense of the word. It might be that a very small number of militants fighting against the Syrian government are non-sectarian idealists who dream of a new Syrian society, which continues to be secular and in addition more human rights respecting than the current government with broader based and 100% free elections etc. pp. Such „moderates“, however, do not play the slightest role in the ongoing military events.

What western governments and their Gulf Arab allies plus Turkey continue to portray and hail as „moderate“ Syrian rebels are in fact militants who meet these criteria:
Insurgents who
– not openly call themselves IS or Jabhat al Nusra (JAN or „Nusra Front“)
– but frequently cooperate with JAN (The „Islamic Front“ even cooperated with IS when they took over Adraa)
– often have joined IS and/or JAN
– seldom hesitate to sell or share their advanced weapons (Manpads, ATGMs) to/with JAN and/or IS
– do not resist being treated in Israeli hospitals
– are often helped by Israel with the latter shooting down Syrian jets and pounding Syrian Army positions (which were then overran by JAN alone or in cooperation with „moderates“)
– are routed and humiliated by JAN in the North but continue to work with JAN in the South (e.g. what SRF has been doing)

Read more about such „moderates“ here:
https://radioyaran.com/2014/09/11/the-vetted-moderate-rebels-of-the-free-syrian-army-who-and-where-are-they/
https://radioyaran.com/2014/09/20/syrian-insurgents-either-salafi-jihadists-or-criminals-and-jamal-maarouf-in-the-middle/
https://radioyaran.com/2014/11/21/al-qaeda-rebels-and-the-southern-front-in-syria/