Check the help for \%u:
/\%d /\%x /\%o /\%u /\%U E678
\%d123 Matches the character specified with a decimal number. Must be
followed by a non-digit.
\%o40 Matches the character specified with an octal number up to 0377.
Numbers below 040 must be followed by a non-octal digit or a non-digit.
\%x2a Matches the character specified with up to two hexadecimal characters.
\%u20AC Matches the character specified with up to four hexadecimal
characters.
\%U1234abcd Matches the character specified with up to eight hexadecimal
characters.
These are sequences you can use. Looks like you have two bytes, so \%u200e
should match it. Anyway, it’s pretty strange. 20 in UTF-8 / ASCII is the space
character, and 0e is ^N. Check your encoding settings.