ruby-on-rails - 如何使用正则表达式获取用户？

Question

例如，用户输入 @John_Smith hi, what's up!?我想给John_Smith的对象打电话，通知他让他注意。
我该如何存档？

username = @comment ??????(I have no idea how to code it here)
@user = User.find_by_username(username)
current_user.send_message(@user, body, subject)

判断方式为@username(一个空格)

Answer 1

username = @comment.scan(/(?<=^@)\w+(?=[\s|~])/).first

控制台测试:

2.0.0-p195 :001 > s = "@John_Smith~hi"
 => "@John_Smith~hi"
2.0.0-p195 :002 > s.scan(/(?<=^@)\w+(?=[\s|_])/).first
 => "John_Smith"

编辑:现在接受 ~ 或空格作为分隔符。