Regular Expressions 101

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/
^(?:(?<timestamp>[^|]+)\|(?<severity>[^|]+)\|(?<x>[^|]+)\|(?<y>[^|]+)\|(?<a>[^|]+)\|(?<b>[^|]+)\|(?<c>[^|]+)(?:\|(?<d>[^|]+))?)$
/
gm
^ asserts position at start of a line
Non-capturing group
(?:(?<timestamp>[^|]+)\|(?<severity>[^|]+)\|(?<x>[^|]+)\|(?<y>[^|]+)\|(?<a>[^|]+)\|(?<b>[^|]+)\|(?<c>[^|]+)(?:\|(?<d>[^|]+))?)
Named Capture Group timestamp
(?<timestamp>[^|]+)
Match a single character not present in the list below
[^|]+
+ Quantifier — Matches 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 severity
(?<severity>[^|]+)
Match a single character not present in the list below
[^|]+
+ Quantifier — Matches 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 x
(?<x>[^|]+)
Match a single character not present in the list below
[^|]+
\| matches the character | literally (case sensitive)
Named Capture Group y
(?<y>[^|]+)
\| matches the character | literally (case sensitive)
Named Capture Group a
(?<a>[^|]+)
\| matches the character | literally (case sensitive)
Named Capture Group b
(?<b>[^|]+)
\| matches the character | literally (case sensitive)
Named Capture Group c
(?<c>[^|]+)
Non-capturing group
(?:\|(?<d>[^|]+))?
$ 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