I need help with the following problems, any help you can provide is deeply appreciated!

OROT IV (5 pts) Create a regular expression representing strings of letters, both upper and lower case, but not allowing adjacent upper-case letters. Allow all such non-empty strings. For instance, fred, Fred, FrEd , FreD fRed and RegulaTionNs, but not FRED, FRed or PerAMBulaTE