/(\w)+\w*\1\w*/i
/(\w)+(\w*\1){3}\w*/i
/^1[10]*1$|^0[10]*0$/
/\b(?=\w*cat)\w{6}\b/
/\b(?=\w*bri)(?=\w*ing)\w{5,9}\b/
/\b(?!.*cat)\w{6}\b/
/(?:\w)*/
/^(?!.*10011)[01]*$/
/\w*(a[eiou]|e[aiou]|i[aeou]|o[aeiu]|u[aeio])\w*/i
/^(?!.*1.1)[01]*$/