Need a multi line regex pattern to find all functions written in a text file (Java regex) [closed]

I have a text file in which there are lots of vba functions are written like below -

function functionName1()
  some code
End function    
function functionName2()
  some code
End function    
function functionName3()
  some code
End function

I want a regex pattern in java which can identify all functions with there matching "end function" and return all the identified function from the file.

Note- Functions are written in multiline not in single line.