Ruby:是值列表中的字符串

有两种方法:

正则表达式:

if mystring =~ /^value(A|B|C)$/ # Use /\Avalue(A|B|C)\Z/ here instead 
   # do something               # to escape new lines
end

if ['valueA', 'valueB', 'valueC'].include?(mystring)
   # do something
end

希望有帮助!

if %w(valueA valueB valueC).include?(mystring)
  # do something
end

假设您希望将此功能扩展到其他匹配组,您还可以使用以下用例:

case mystring
when "valueA", "valueB", "valueC" then
 #do_something
when "value1", "value2", "value3" then
 #do_something else
else
 #do_a_third_thing
end