How to capture the Yandex Bot from Web log file?

Here are some Web log file entries:127.0.0.1 - frank [10/May/2012:13:55:36 -0700] "GET /apache_pb.gif HTTP/1.0" 200 2326 "-" "Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)" "-" 213.135.131.79 - - [13/May/2012:17:35:32 -0600] "POST /submit.jsp HTTP/1.0" 200 2326 "-" "Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)" "SID=1000;LANG=EN" 213.135.131.79 - - [15/May/2012:19:21:49 -0400] "GET /features.htm HTTP/1.1" 200 9955 "http://www.abc.com/" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461)" "-"

Yandex Bot is a web crawler from Yandex that obtains content for the Yandex Search engine. Yandex Bot uses the following user agent string:

Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)/bots)

The regular expression to capture Yandex Bot entries from Apache Web log file can be written as: ^.*"(.*YandexBot[^"]*)".*$ with the multiple lines modifier "m" specified: m