Regular Expressions 101

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/
^(?<vendor_date>\d{4}(?:\-\d\d){2} [^+,],[^+:]):(?<vendor_level>[^+:]):(?<vendor_component>[^+:]):(?<vendor_message>[^+\n\r])(?<vendor_details>(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+)?
/
gm
^ asserts position at start of a line
Named Capture Group vendor_date
(?<vendor_date>\d{4}(?:\-\d\d){2} [^+,],[^+:])
\d
matches a digit (equivalent to [0-9])
{4} matches the previous token exactly 4 times
Non-capturing group
(?:\-\d\d){2}
{2} matches the previous token exactly 2 times
\- matches the character - literally (case sensitive)
\d matches a digit (equivalent to [0-9])
\d matches a digit (equivalent to [0-9])
matches the character literally (case sensitive)
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 the character , literally (case sensitive)
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 the character : literally (case sensitive)
Named Capture Group vendor_level
(?<vendor_level>[^+:])
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 the character : literally (case sensitive)
Named Capture Group vendor_component
(?<vendor_component>[^+:])
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 the character : literally (case sensitive)
Named Capture Group vendor_message
(?<vendor_message>[^+\n\r])
Match a single character not present in the list below
[^\n\r]
Named Capture Group vendor_details
(?<vendor_details>(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+)?
? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)
Conditional
(?(?=^\d{4}(?:\-\d\d){2})|[^\r])+
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