Postgres friendly RegEx?

Anyone care to correct this regex for PostgreSQL?  It works in C++ but Postgres have no love for it:

 

-{0,1}\d*\.{0,1}\d+\^{0,1}\d*\.{0,1}\d+

 

This regex accepts  (any num)^(pos num)  such as:

45.2^3

-45.2^3

10^2.5