Regular Expressions 101

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/
(?:```(?:[^`](?!\n\n))+?```|`(?:[^`](?!\n\n))+?`)
/
gm
Non-capturing group
(?:```(?:[^`](?!\n\n))+?```|`(?:[^`](?!\n\n))+?`)
1st Alternative
```(?:[^`](?!\n\n))+?```
``` matches the characters ``` literally (case sensitive)
Non-capturing group
(?:[^`](?!\n\n))+?
+? Quantifier — Matches between one and unlimited times, as few times as possible, expanding as needed (lazy)
Match a single character not present in the list below
[^`]
` matches the character ` literally (case sensitive)
Negative Lookahead
(?!\n\n)
Assert that the Regex below does not match
\n matches a line-feed (newline) character (ASCII 10)
\n matches a line-feed (newline) character (ASCII 10)
``` matches the characters ``` literally (case sensitive)
2nd Alternative
`(?:[^`](?!\n\n))+?`
` matches the character ` literally (case sensitive)
Non-capturing group
(?:[^`](?!\n\n))+?
+? Quantifier — Matches between one and unlimited times, as few times as possible, expanding as needed (lazy)
Match a single character not present in the list below
[^`]
` matches the character ` literally (case sensitive)
Negative Lookahead
(?!\n\n)
Assert that the Regex below does not match
\n matches a line-feed (newline) character (ASCII 10)
\n matches a line-feed (newline) character (ASCII 10)
` matches the character ` literally (case sensitive)
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.

Regular Expression
No Match

/
/
gm

Test String