Handle new lines in regex match

I am having a problem getting the correct regex for this on Regex Hero. Below is my text but the message as it MIGHT contain enter so it's not getting correctly matched. Any help is appreciated.

Contact Number: (?.+|)

Message : (?.+|)

Subscription : (?.+|)

Contact Number: 00971573747343434

Message : Hi
I want to test something

Subscription : False

Dear @Mazenx,
Welcome to community! Where exactly are you trying to use it? What should be the expected result?

I am trying to use it inside Microsoft Flow,

What I want to achieve is to capture the full message til the line which in that case is the subscription.

so I wanted the message object to contain everything "Hi, I want to test something"