Regular Expressions 101

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/
(?J)^[^+f] (?<vendor_product>[^+\.]).(?<vendor_module>[^+\s])\s+\[(?<pid>[+\d])]:\s(?<vendor_level>[+\w])\s+(\[(?<jail>[^+\]])]\s)?(?<vendor_message>(?<vendor_action>Found|Ban|Unban|Restore Ban)?\s?(?<src>(?:(?:25[0-5]|2[0-4][0-9]|[?01][0-9][?0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|[?01][0-9][?0-9]))\s?(?<vendor_action>already banned|is not banned| - ((?<initial_date>.*))?)?|.*)$
/
gm
(?J)
match the remainder of the pattern with the following effective flags: gmJ
J modifier: Allow duplicate subpattern names
^ asserts position at start of a line
Match a single character not present in the list below
[^f]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
f matches the character f literally (case sensitive)
matches the character literally (case sensitive)
Named Capture Group vendor_product
(?<vendor_product>[^+\.])
Match a single character not present in the list below
[^\.]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\. matches the character . literally (case sensitive)
. matches any character (except for line terminators)
Named Capture Group vendor_module
(?<vendor_module>[^+\s])
Match a single character not present in the list below
[^\s]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\[ matches the character [ literally (case sensitive)
Named Capture Group pid
(?<pid>[+\d])
]: matches the characters ]: literally (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Named Capture Group vendor_level
(?<vendor_level>[+\w])
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
5th Capturing Group
(\[(?<jail>[^+\]])]\s)?
Named Capture Group vendor_message
(?<vendor_message>(?<vendor_action>Found|Ban|Unban|Restore Ban)?\s?(?<src>(?:(?:25[0-5]|2[0-4][0-9]|[?01][0-9][?0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|[?01][0-9][?0-9]))\s?(?<vendor_action>already banned|is not banned| - ((?<initial_date>.*))?)?|.*)
$ asserts position at the end of a line
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String