Something like this?
:%s/\s\+$//
What I want is remove these spaces in this function, even user put
spaces at end of line.
Where are these lines? A single line in a string variable? Multiple
lines in a string variable? List variable? ... ?
At a quick guess, maybe something like this is closer to what you want.
:echo substitute("your text here ",'\s\+$','','')
Ben.
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