Zabbix

..F....... [ZBX-7831] fixed regexp compilation errors for installations that use PHP with PCRE older than 7.0

Before the fix:
- When using PHP with PCRE older than 7.0 some of the regular expressions in the frontend would trigger a "preg_match_all(): Compilation failed" error. The error appeared because older versions of the PCRE library required the "P"  flag before named sub patterns.
 
 After the fix:
 - The regular expressions have been corrected to be compatible with older PCRE versions.