re = /^(?!^[\p{Z}]|.*[\p{Z}]$).*$/m
str = ' x
x
xx
xx
char \\u2000 at start
char \\u2000 at end
in middle char \\u2000'
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html