Regular Expressions 101

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/
^{+({.*?})}+$
/
^ asserts position at start of the string
{
matches the character { literally (case sensitive)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
1st Capturing Group
({.*?})
{ matches the character { 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 } literally (case sensitive)
}
matches the character } literally (case sensitive)
+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of the string
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String