The re- part of regain is a prefix.
do it again exampel "redo the dishes"
The prefix "re" in "regain" signifies the idea of doing something again or returning to a previous state. It implies restoration or recovery, as in getting something back that was lost. This prefix is commonly used in other words to convey a similar meaning of repetition or repetition of a process.
Re- is the prefix of back or again. Some other words for this are revise, report, regain, realign, etc.
regain
Odysseus regain .............................
Ohio's regain is East.
She needs to regain her strength.
Regain Records was created in 1997.
Regain is one whole word, re-gain.
He went to drama classes, to try and regain his confidence.
moisture regain of cotton is 14-15%
regainrehab-dot-com