Count total number of pattern between two pattern (using sed if possible) in Linux

I have to count all '=' between two pattern i.e '{' and '}' Sample:

{
100="1";
101="2";
102="3";
}; 
{
104="1,2,3";
};
{
105="1,2,3";
};

Expected Output:

3
1
1

A very cryptic perl answer:

perl -nE 's/\{(.*?)\}/ say ($1 =~ tr{=}{=}) /ge'

The tr function returns the number of characters transliterated.

With the new requirements, we can make a couple of small changes:

perl -0777 -nE 's/\{(.*?)\}/ say ($1 =~ tr{=}{=}) /ges'

• -0777 reads the entire file/stream into a single string
• the s flag to the s/// function allows . to handle newlines like a plain character.