[Fix] Fix extra hits in PCRE mode for regular expressions
[Fix] Fix extra hits in PCRE mode for regular expressions

MFH: rspamd-1.6
Issue: #1880

AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,AlexeySa/rspamd