import re
regex = r"\b([A-Z0-9]{1,3})/([A-Z0-9]{1,3})\b|/.*"
text = ("CENTRAL CARE HOSPITAL/HOPITAL CENTRALE DE SOINS\n"
"ABC/DEF\n"
"FOUNDATION INSTITUTION/FUNDATION DEL INSTITUTO\n"
"HAPPY SPRING BREAK 20/20")
result = re.sub(regex, r"\1 \2", text)
print (result)
aW1wb3J0IHJlCgpyZWdleCA9IHIiXGIoW0EtWjAtOV17MSwzfSkvKFtBLVowLTldezEsM30pXGJ8Ly4qIgoKdGV4dCA9ICgiQ0VOVFJBTCBDQVJFIEhPU1BJVEFML0hPUElUQUwgQ0VOVFJBTEUgREUgU09JTlNcbiIKCSJBQkMvREVGXG4iCgkiRk9VTkRBVElPTiBJTlNUSVRVVElPTi9GVU5EQVRJT04gREVMIElOU1RJVFVUT1xuIgoJIkhBUFBZIFNQUklORyBCUkVBSyAyMC8yMCIpCgpyZXN1bHQgPSByZS5zdWIocmVnZXgsIHIiXDEgXDIiLCB0ZXh0KQpwcmludCAocmVzdWx0KQ==