只解析第二个regex匹配(webserver日志)？

Question

我有以下(AWS负载均衡器格式)日志文件示例行，我想解析。

http 2017-08-01T00:25:06.644602Z app/webservices/2f179337c6c8adb5
46.229.168.65:7336 172.31.26.99:82 0.000 0.574 0.000 200 200 257 192227 "GET http://trac.navit-project.org:80/timeline?from=2011-04-16T07%3A23%3A03Z&precision=second HTTP/1.1" "Mozilla/5.0 (compatible; SemrushBot/1.2~bl;
+http://www.semrush.com/bot.html)" - - arn:aws:elasticloadbalancing:us-west-2:712275310776:targetgroup/trac/34e2ac9af93f42de "Root=1-597fca61-4dfde4b02cd92cf61ace9825"

我有一个至少部分工作的正则表达式，如下所示：

match = re.search(r'\"(?P<agent>.*?)\"', line)
print(match)

问题是正则表达式只匹配上面日志行中的第一组引号。

<_sre.SRE_Match object; span=(138, 241), match='"GET http://trac.navit-project.org:80/timeline?fr>

是否有一种方法可以修改它以查找第二个匹配，以便我可以解析用户代理？

Answer 1

将正则表达式更改为

"[^"]+"[^"]+"(?P<agent>[^"]*)"

说明：

"                     # opening first "-set
[^"]+                 # followed by anything not equal to "
"                     # closing first "
[^"]+                 # followed by anything not equal to "
"                     # opening second "-set
(?P<agent>[^"]*)      # named group agent
"                     # closing "