The Regiment
In many nations' armies a regiment is a fighting formation. This is untrue in Canada and most Commonwealth nations.
In Canada and the UK, a regiment is more like a military family. It may consist of one unit or it may include several units.
Typically, Canadian regiments only consist of one unit, however there are several examples of infantry regiments which consist of multiple units called battalions. The R22eR includes three regular force battalions (numbered 1 to 3) and two reserve force battalions (numbered 4 and 6).
While soldiers can be posted in and out of units & formations, a soldier will keep the same regiment throughout a career. The soldier will wear the capbadge and shoulder titles of his regiment regardless of where he is posted. The exception to this is officers promoted to Col or higher, and CWOs filling certain appointments.