Thanks. I didn't know about Concise.
The only difference I can see in these two is the asterisk (*):
</> pushre(/"\\s+"/ => @f) s*/64 ->4 (split " ") </> pushre(/"\\s+"/ => @f) s/64 ->4 (split ?\s+?)
The most I've been able to find out is that the '*' means 'do something weird for this op' and a reference to op.h, which says 'On pushre, re is /\s+/ imp. by split " "'. We already know this.
So this is gonna have to be one of those cases where I'm just gonna have to accept it as a peculiarity of perl. This is not a big issue as I won't be running into this any time soon again.
Also, the magic only happens when assigning to an array, using in implied contexts or assigning to a scalar the " " is *not* converted to ?\s+?.