Regular Expressions 101

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/
"([^}}])+{{|"$
/
gm
1st Alternative
"([^}}])+{{
" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
1st Capturing Group
([^}}])+
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
Match a single character not present in the list below
[^}}]
}}
matches a single character in the list } (case sensitive)
{{
matches the characters {{ literally (case sensitive)
2nd Alternative
"$
" matches the character " with index 3410 (2216 or 428) literally (case sensitive)
$ 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