regular expression

[mtk468]

Please help me with the following problems . I want the regular expressions for:
1) a set of strings including {d, abd, cd, abcd}
2) a set of strings of x's, y's and z's
for example {xxx, xxy, xxz,.......zzz}

[mikesgt2]

I do not understand. What exactly do you want to do?

[bretticus]

Is this a coded spy message??? huh???