I only found I can find A or B in UltraEdit Help, http://www.ultraedit.com/support/tutorials_power_tips/ultraedit/regular_expressions.html#or
^{A^}^{B^} (A|B) Matches expression A OR B.
Now I want to find A or B or C, how to do?
Currently UltraEdit only allows for the specification of two operands for an OR expression
In theory, you could nest the expressions:
^{A^}^{^{B^}^{C^}}
(A|(B|C))
Matches expression A OR (B OR C)
but as I've never used UltraEdit, you'd have to try it yourself.