我知道捕获组(?:模式)开头的问号表示此模式不应创建反向引用,但在以下示例中,问号在通配符后面的捕获组的末尾??在捕获组的末尾
self =~ /(.*?)_(\d+)$/
代码
class String
# used to instantiate a model based on a dom_id style
# identifier like "person_10"
def to_model
self =~ /(.*?)_(\d+)$/
class_name, id = $1, $2
class_name.classify.constantize.find(id)
end
end
另请参阅http://stackoverflow.com/q/13401514/10396 – AShelly