Regular Expressions 101

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/
\{([^:{]+):([^{}]+)\}
/
g
\{ matches the character { with index 12310 (7B16 or 1738) 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 a single character in the list :{ (case sensitive)
: matches the character : with index 5810 (3A16 or 728) literally (case sensitive)
2nd 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 a single character in the list {} (case sensitive)
\} 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