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<?php echo preg_replace('#[^\p{L} 0-9?!]#ui', '', mysql_real_escape_string($_POST['searchquery'])); ?>
based on qWklv
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /in/XCS4b:1 Stack trace: #0 {main} thrown in /in/XCS4b on line 1
Process exited with code 255.
Output for hhvm-3.12.0
Notice: Undefined index: searchquery in /in/XCS4b on line 1 Warning: supplied argument is not a valid MySQL-Link resource in /in/XCS4b on line 1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.6.28
Fatal error: Call to undefined function mysql_real_escape_string() in /in/XCS4b on line 1
Process exited with code 255.
Output for 4.4.0 - 4.4.9
Notice: Undefined index: searchquery in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): A link to the server could not be established in /in/XCS4b on line 1
Output for 4.3.11
Notice: Undefined index: searchquery in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): A link to the server could not be established in /in/XCS4b on line 1 Warning: preg_replace(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in /in/XCS4b on line 1
Output for 4.3.2 - 4.3.10
Notice: Undefined index: searchquery in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /in/XCS4b on line 1 Warning: mysql_real_escape_string(): A link to the server could not be established in /in/XCS4b on line 1 Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in /in/XCS4b on line 1
Output for 4.3.0 - 4.3.1
Notice: Undefined index: searchquery in /in/XCS4b on line 1 Warning: mysql_real_escape_string() [http://www.php.net/function.mysql-real-escape-string]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /in/XCS4b on line 1 Warning: mysql_real_escape_string() [http://www.php.net/function.mysql-real-escape-string]: A link to the server could not be established in /in/XCS4b on line 1 Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 3 in /in/XCS4b on line 1