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Remove preg_quote() call from CI_User_agent::_set_browser() and add a…
…nother pattern for Opera Input comes from a configuration file that is barely touched by anyone and the default values only contain letters, so it is safe to not quote them. This enables us to add a more advanced pattern in config/user_agents.php for Opera 10+, which ... quote: Opera/9.80 is hard coded at the beginning of the user agent string because of broken browser sniffing scripts which detect 'Opera/10' and above as Opera 1. (reference: http://my.opera.com/community/openweb/idopera/) Instead, latests versions of Opera append ' Version/<version number>' to the end of the user agent string. Fixes issue #555 (incorrect browser detection for Opera)
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