Regular Expressions 101

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/
(?:[* \t][a-z][)]\s*)?([^+\r\n<](?:(?:\r?\n(?!\s*[a-z][)])|<(?!br\s*\/?>(?:\s*<br\s*\/?>)*\s*(?:\s+[a-z][)]|\s*$)))[^*\r\n<])*)(?:<br\s*\/?>\s*)*
/
gm
Non-capturing group
(?:[* \t][a-z][)]\s*)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[ \t]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
matches the character literally (case sensitive)
\t matches a tab character (ASCII 9)
Match a single character present in the list below
[a-z]
a-z matches a single character in the range between a (index 97) and z (index 122) (case sensitive)
Match a single character present in the list below
[)]
) matches the character ) literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
1st Capturing Group
([^+\r\n<](?:(?:\r?\n(?!\s*[a-z][)])|<(?!br\s*\/?>(?:\s*<br\s*\/?>)*\s*(?:\s+[a-z][)]|\s*$)))[^*\r\n<])*)
Match a single character not present in the list below
[^\r\n<]
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
\r matches a carriage return (ASCII 13)
\n matches a line-feed (newline) character (ASCII 10)
< matches the character < literally (case sensitive)
Non-capturing group
(?:(?:\r?\n(?!\s*[a-z][)])|<(?!br\s*\/?>(?:\s*<br\s*\/?>)*\s*(?:\s+[a-z][)]|\s*$)))[^*\r\n<])*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Non-capturing group
(?:\r?\n(?!\s*[a-z][)])|<(?!br\s*\/?>(?:\s*<br\s*\/?>)*\s*(?:\s+[a-z][)]|\s*$)))
1st Alternative
\r?\n(?!\s*[a-z][)])
\r
matches a carriage return (ASCII 13)
\n matches a line-feed (newline) character (ASCII 10)
Negative Lookahead
(?!\s*[a-z][)])
Assert that the Regex below does not match
2nd Alternative
<(?!br\s*\/?>(?:\s*<br\s*\/?>)*\s*(?:\s+[a-z][)]|\s*$))
Match a single character not present in the list below
[^\r\n<]
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\r matches a carriage return (ASCII 13)
\n matches a line-feed (newline) character (ASCII 10)
< matches the character < literally (case sensitive)
Non-capturing group
(?:<br\s*\/?>\s*)*
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
<br matches the characters <br literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
\/
matches the character / literally (case sensitive)
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
> matches the character > literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v ])
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