Regular Expressions 101

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/
(\{(?:(?1)|[^{}]*+)++\})|[^{}\s]++
/
g
1st Alternative
(\{(?:(?1)|[^{}]*+)++\})
1st Capturing Group
(\{(?:(?1)|[^{}]*+)++\})
\{ matches the character { with index 12310 (7B16 or 1738) literally (case sensitive)
Non-capturing group
(?:(?1)|[^{}]*+)++
++ matches the previous token between one and unlimited times, as many times as possible, without giving back (possessive)
1st Alternative
(?1)
(?1) recurses the 1st subpattern
2nd Alternative
[^{}]*+
Match a single character not present in the list below
[^{}]
*+ matches the previous token between zero and unlimited times, as many times as possible, without giving back (possessive)
{}
matches a single character in the list {} (case sensitive)
\} matches the character } with index 12510 (7D16 or 1758) literally (case sensitive)
2nd Alternative
[^{}\s]++
Match a single character not present in the list below
[^{}\s]
++ matches the previous token between one and unlimited times, as many times as possible, without giving back (possessive)
{}
matches a single character in the list {} (case sensitive)
\s matches any whitespace character (equivalent to [\r\n\t\f\v ])
Global pattern flags
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
g

Test String