I think it would make multiline handling easier if there were an option in the Regex Split node for DOTALL. Without that, the user should add the (?s) to the beginning of the pattern to achieve success when the pattern includes .*s/.+s. Or at least it worth noting in the node description. What do you think?
PS.: Maybe it is only me who always forgets this switch and others use this naturally, but thought it might worth noting this.