Generalized Regular expression for a possible combinations

[SAI KALYAN]

I need to write a regular expression which allows some possible combinations of string like , what would be the best way to handle this

CP_[Z0-9].[Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9]
CP_[Z0-9][Z0-9].[Z0-9][Z0-9]
CP_[Z0-9][Z0-9].[Z0-9][Z0-9].[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9]RC[Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9]RC[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9][Z0-9]RC[Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9][Z0-9]RC[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9].[Z0-9]RC[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9]P[Z0-9]
CP_[Z0-9].[Z0-9]PR[Z0-9]
CP_[Z0-9].[Z0-9]PRE[Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]P[Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]PR[Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]PRE[Z0-9]
CP_[Z0-9].[Z0-9]P[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9]PR[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9]PRE[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]P[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]PR[Z0-9][Z0-9]
CP_[Z0-9].[Z0-9][Z0-9]PRE[Z0-9][Z0-9]




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