You run a regular expression against it to extract the user agent string.

您针对这个对象运行一个正则表达式，提取用户代理字符串。

youdao

Make sure to use the correct user agent string, since this is the value the portal USES to match an incoming request to your device.

请确保使用正确的用户代理字符串，因为门户使用该值来使入站请求与设备匹配。

youdao

The second line, the first rewrite condition, indicates that following rules only apply when the user-agent string in the HTTP request header contains the substring MSIE.

第二行的第一个重写条件表明：下面的规则仅适用于HTTP请求报头中的user - agent字符串包含子字符串msie的情形。

youdao

With Mr. Hanie becoming a restricted free agent in 2011 and with the Bears 2nd string QB Todd Collins looking as confident as Woody Allen and as mobile as Frankenstein, the Bears will have some extremely interesting resource allocation decisions to make at the quarterback position.

FORBES: Did Hanie's Comet Just Pass Cutler's Fading Star?