.mybox { /* Compliant */
}

#my-box { /* Compliant */
}

div { /* Compliant */
}

.MYbOx { /* Noncompliant ![sc=2;ec=7;el=+0]! !{Rename selector "MYbOx" to match the regular expression: ^[a-z][-a-z0-9]*$}! */
}

.ab_cd { /* Noncompliant ![sc=2;ec=7;el=+0]! !{Rename selector "ab_cd" to match the regular expression: ^[a-z][-a-z0-9]*$}! */
}

.abcd #rrr div { /* Compliant */
}

.abcd #-rrr div { /* Noncompliant ![sc=8;ec=12;el=+0]! !{Rename selector "-rrr" to match the regular expression: ^[a-z][-a-z0-9]*$}! */
}