I have a file a.txt,

one two
two one

my goal is to match the ‘one’ that is at the end of the sentence.

if it is opened in less (less a.txt) , and manually searched by regex (/one$),
as expected, it will match the ‘one’ in second line.

However if it is opened with,
less --pattern='one$' a.txt,
opened file will match the both ‘one’s.

I also tried less '+/one$' a.txt, which resulted in same outcome.