Regular Expressions 101

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/
@media([^{]+)\{([\s\S]+?})\s*}
/
g
@media
matches the characters @media literally (case sensitive)
1st Capturing Group
([^{]+)
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 { with index 12310 (7B16 or 1738) literally (case sensitive)
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
2nd Capturing Group
([\s\S]+?})
Match a single character present in the list below
[\s\S]
+? matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\s matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
\S matches any non-whitespace character (equivalent to [^\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
\s
matches any whitespace character (equivalent to [\r\n\t\f\v \u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff])
* matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)
} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
g

Test String