How to use regular express to get the abbreviation of a string?

[Guest]

for example,

Aaaa Bbbbb Ccccc Dddddd Eeeee

to ABCDE

string length may vary

Thanks

 

[Guest]

for example,

Aaaa Bbbbb Ccccc Dddddd Eeeee

to ABCDE

string length may vary

Thanks

So in reality you want to get a string where everything but upper case
letters are removed?

string abbrev = Regex.Replace(someString, "[^A-Z]+", string.Empty);