我設置的fail2ban來保護主機,我已經注意到這條信息的fail2ban <HOST>正則表達式別名解釋
#_daemon = asterisk
# Option: failregex
# Notes.: regex to match the password failures messages in the logfile. The
# host must be matched by a group named "host". The tag "<HOST>:.*" can
# be used for standard IP/hostname matching and is only an alias for
# (?:::f{4,6}:)?(?P<host>\S+)
# Values: TEXT
如何進行(?:::f{4,6}:)?(?P<host>\S+)
正則表達式的工作?我一直在嘗試使用幾種不同的正則表達式檢查器和解釋器,並且沒有人能解析它,至少是(?P<host>\S+)
部分。