Remove text within a symbol including symbol

I have a project where I’m trying to read all files in a folder and remove specific text between the given symbol.
I have a text file that contains text within #! and I would like to remove all text within #!
What I have so far,

The expression I have is : System.Text.RegularExpressions.Regex.Replace(txtinput,"(?<=#!).*(?=#!)"," ")

The current output I get,

image

thanks for anyone who can help

@chukz
I would suggest to look for finding the reason for this behaviour here by the statement explanation (taken from regex101)

grafik

Maybe this helps for rewriting the statement

Give a try by using an ungreedy approach as below:
grafik
grafik

(#!)((.*?\r?\n?)*)(#!)

Thank you it worked. Thanks for sharing the regex101 as well.

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