Regular Expressions 101

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/
@media.*?(\{([^{}]|(?1))*\})
/
@media
matches the characters @media 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)
1st Capturing Group
(\{([^{}]|(?1))*\})
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
2nd Capturing Group
([^{}]|(?1))*
* matches the previous token between zero 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
1st Alternative
[^{}]
Match a single character not present in the list below
[^{}]
{}
matches a single character in the list {} (case sensitive)
2nd Alternative
(?1)
(?1) recurses the 1st subpattern
\} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/

Test String

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