Continue a long expression on multiple lines

I have a very lengthy algebraic expression in a script that needs to be split into multiple lines, such as the following example

4+5+3+ ...

1+55+6- ...

4*6+8+ ...

etc (suppose there are 1000 more lines of the expression)

Notice that I have manually typed three dots at the end of each line to keep up the flow, but is there a way to let Matlab add the three dots automatically at the end of each line?

[Stephan]

Do you have the expression as a text file or something you can provide here?

[Mathieu NOE]

hello

is it not possible to simply copy paste that in a txt file and load the file ?.

[Walter Roberson]

I use an external editor (vi) for this kind of work. However the expressions I am working with usually need more manipulation than that, such my wanting to add spaces around operators, so I am usually doing a bunch of regular expression work and adding the dots is usually the easiest part of that editing.

[Harry Lee]

Thanks, I just used an external editor to do that, it worked.