How do I write regex for this pattern? C-E-SEM-MEAS.E-PYRO2-25M-RX-ETDR.01 [on hold]

I need a regex pattern for this C-E-SEM-MEAS.E-PYRO2-25M-RX-ETDR.01

Here the 2nd and 3rd character must be -E and also there must be .E in the pattern. How can I achieve this?