Regular Expressions 101

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"
\{\{.*?\}\}|\{%.*?%}
"
gm
1st Alternative
\{\{.*?\}\}
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
\} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
\} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
2nd Alternative
\{%.*?%}
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
% matches the character % with index 3710 (2516 or 458) literally (case sensitive)
.
matches any character (except for line terminators)
*? matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
%}
matches the characters %} 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