Please note that different regulators may have different pinouts - see datasheets. 5V Options:
REG001 - 5V 100mA Voltage Regulator (78L05)
REG002 - 5V 1A Fixed Voltage Regulator (7805)
REG005 - 250mA 5V low dropout voltage regulator (MCP1702 series, higher quality than 78L05). 3V Options:
REG004 - 250mA 3.3V low dropout voltage regulator