Is vwwx regular language?
Let's try to figure out which words are in $L$ and which aren't. If a word $w$ contains 00 or 11 then it is certainly in $L$. Otherwise, it alternates between zeroes and ones. If it contains 0101 or 1010 then it is in $L$. We are left with the words of length at most three, that is $\epsilon,1,0,10,01,101,010$. These are the only words not in $L$. Since $L$ is cofinite, it is regular.