Fix an issue with OTP28 and dispatch regexp compilation

[mworrell]

Fix #7

[mworrell]

Problem is that re:compile on OTP28 returns a datatype with a reference(). Before OTP28 this was a binary.

OTP27:

1> re:compile(<<"/ab/">>).
{ok,{re_pattern,0,0,0,
                <<69,82,67,80,79,0,0,0,0,0,0,0,81,0,0,0,255,255,255,255,
                  255,255,...>>}}

OTP28:

1> re:compile(<<"/ab/">>).
{ok,{re_pattern,0,0,0,#Ref<0.1301874519.907149322.13759>}}

[mworrell]

Fixed using term storage for storing the compiled regexp, instead of directly including the compiled regexp into the syntax trees.