How to format raw string with different expressions inside?

Question

Let\'s say, we want to catch something with regex, using rawstring to define the pattern, which pattern has repeating elements, and variables inside. And we also want to use

Answer 1

Use f-strings (introduced in Python 3.6):

a = 15
print(fr'Escape is here:\n but still {a}')

# => Escape is here:\n but still 15