How to match a method block using regex?

Question

Take an example.

 public static FieldsConfig getFieldsConfig(){
    if(xxx) {
      sssss;
    }
   return;
}

I write a regex, \"\\\\

Answer 1

Try this

((?\h+)public\s+static\s+[^(]+\([^)]*?\)\s*\{.*?\k\})|(public\s+static\s+[^(]+\([^)]*?\)\s*\{.*?\n\})

Explanation:
We will capture method block start by keyword public end to }, public and } must have the same \s character so your code must be well format : ) https://en.wikipedia.org/wiki/Indent_style

\h: match whitespace but not newlines
(?\h+): Get all whitespace before public then group in space name
public\s+static\s public static
[^(]: any character but not (
([^)]: any but not )
\k\}: } same number of whitespace then } at the end.

Demo

Input:

public static FieldsConfig getFieldsConfig(){
    if(xxx) {
      sssss;
    }
   return;
}

NO CAPTURE

public static FieldsConfig getFieldsConfig2(){
    if(xxx) {
      sssss;
    }
   return;
}

NO CAPTURE

    public static FieldsConfig getFieldsConfig3(){
        if(xxx) {
          sssss;
        }
       return;
    }

NO CAPTURE

        public static FieldsConfig getFieldsConfig4(){
            if(xxx) {
              sssss;
            }
           return;
        }

Output:

MATCH 1
3.  [0-91]  `public static FieldsConfig getFieldsConfig(){
    if(xxx) {
      sssss;
    }
   return;
}`

MATCH 2
3.  [105-197]   `public static FieldsConfig getFieldsConfig2(){
    if(xxx) {
      sssss;
    }
   return;
}`

MATCH 3
1.  [211-309]   `   public static FieldsConfig getFieldsConfig3(){
        if(xxx) {
          sssss;
        }
       return;
    }`

MATCH 4
1.  [324-428]   `       public static FieldsConfig getFieldsConfig4(){
            if(xxx) {
              sssss;
            }
           return;
        }`