Regex: /^\[.+] (.+): /gm
Original text:
[16:30, 2/1/2018] Sender 1 Name: <Message>
[16:31, 2/1/2018] Sender 2 Name: <Message>
Selection (delete this):
[16:30, 2/1/2018] Sender 1 Name:
[16:31, 2/1/2018] Sender 2 Name:
Regex: /^\[.+] (.+): /gm
Original text:
[16:30, 2/1/2018] Sender 1 Name: <Message>
[16:31, 2/1/2018] Sender 2 Name: <Message>
Selection (delete this):
[16:30, 2/1/2018] Sender 1 Name:
[16:31, 2/1/2018] Sender 2 Name: