Java regex how to find the parent match?

Question

Any page from Wikipedia:

...
abas asdn asf asfs af
{{Template1
|a = Name surname
|b = jhsdf sdf
|c = {{Template2}}
|d = 
|e = [[f]] and [[g]]
|h = asd asdasfgasgasg asgas jygh trdx dftf xcth
|i = 73
|j = {{Template2|abc|123}}
|j = {{Template3|aa=kkk|bb={{Template4|cc=uu}}}}
}}

asd wetd gdsgwew g

{{OtherTemplate
|sdf = 213
}}
...

How can i find Template1's content (start is |a end is }}) with Java regexes?

I tried:

String pattern = "\\{\\{\\s*Template1\\s*(.*?)\\}\\}";

Pattern p = Pattern.compile(pattern, Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
Matcher m = p.matcher(content);

while (m.find()) {
    if (!m.group().equals("")) {
        System.out.println(m.group());
        System.out.println("-----------------------");
    }
}

But in here the regex is finding the first }} (which is Template2 }}) then stops.
I want to pass }} is any {{ is open. Then I want to find top parent match.

I want to get top Template1 content between top {{ and }}?.

EDIT:

Please keep in mind that I am parsing content after removing white spaces.

content.replaceAll("\\s+","");  

Think of content as writing a single line.

Answer 1

/^{{Template1(.*?)^}}/sm

returns:

|a = Name surname
|b = jhsdf sdf
|c = {{Template2}}
|d = 
|e = [[f]] and [[g]]
|h = asd asdasfgasgasg asgas jygh trdx dftf xcth
|i = 73
|j = {{Template2|abc|123}}
|j = {{Template3|aa=kkk|bb={{Template4|cc=uu}}}}

https://regex101.com/r/qC6cM1/1 (DEMO)