[GENERAL] Postgres friendly RegEx?

[Jon Asher]

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