ByteLen checks byte length of a string must be in a range.

ByteMatch checks a string must be matching a regex on bytes.

EQ checks a string must equal to a string.

In checks a string must be in a list.

NotIn checks a string must be not in a list.

RuneLen checks rune length of a string must be in a range.

RuneMatch checks a string must be matching a regex on runes.