https://www.graalvm.org/ 
abstract class com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode extends com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultPropertyNode
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode
  super_class: com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultPropertyNode
{
  private final int groupNumber;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  static final boolean $assertionsDisabled;
    descriptor: Z
    flags: (0x1018) ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 291
            ldc Lcom/oracle/truffle/js/builtins/RegExpBuiltins;
            invokevirtual java.lang.Class.desiredAssertionStatus:()Z
            ifne 1
            iconst_1
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: putstatic com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.$assertionsDisabled:Z
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>(com.oracle.truffle.js.runtime.JSContext, com.oracle.truffle.js.nodes.function.JSBuiltin, int);
    descriptor: (Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;I)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode this
        start local 1 // com.oracle.truffle.js.runtime.JSContext context
        start local 2 // com.oracle.truffle.js.nodes.function.JSBuiltin builtin
        start local 3 // int groupNumber
         0: .line 296
            aload 0 /* this */
            aload 1 /* context */
            aload 2 /* builtin */
            invokespecial com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultPropertyNode.<init>:(Lcom/oracle/truffle/js/runtime/JSContext;Lcom/oracle/truffle/js/nodes/function/JSBuiltin;)V
         1: .line 297
            getstatic com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.$assertionsDisabled:Z
            ifne 2
            iload 3 /* groupNumber */
            ifge 2
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
         2: .line 298
      StackMap locals: com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode com.oracle.truffle.js.runtime.JSContext com.oracle.truffle.js.nodes.function.JSBuiltin int
      StackMap stack:
            aload 0 /* this */
            iload 3 /* groupNumber */
            putfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.groupNumber:I
         3: .line 299
            return
        end local 3 // int groupNumber
        end local 2 // com.oracle.truffle.js.nodes.function.JSBuiltin builtin
        end local 1 // com.oracle.truffle.js.runtime.JSContext context
        end local 0 // com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    4     0         this  Lcom/oracle/truffle/js/builtins/RegExpBuiltins$JSRegExpStaticResultGetGroupNode;
            0    4     1      context  Lcom/oracle/truffle/js/runtime/JSContext;
            0    4     2      builtin  Lcom/oracle/truffle/js/nodes/function/JSBuiltin;
            0    4     3  groupNumber  I
    MethodParameters:
             Name  Flags
      context      
      builtin      
      groupNumber  

  java.lang.String getGroup(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/String;
    flags: (0x0000) 
    Code:
      stack=5, locals=4, args_size=2
        start local 0 // com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode this
        start local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
         0: .line 303
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.getContext:()Lcom/oracle/truffle/js/runtime/JSContext;
            aload 1 /* frame */
            invokestatic com.oracle.truffle.js.runtime.JSFrameUtil.getThisObj:(Lcom/oracle/truffle/api/frame/Frame;)Ljava/lang/Object;
            invokestatic com.oracle.truffle.js.builtins.RegExpBuiltins.checkStaticRegexResultPropertyGet:(Lcom/oracle/truffle/js/runtime/JSContext;Ljava/lang/Object;)V
         1: .line 304
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.getResultNode:Lcom/oracle/truffle/js/builtins/RegExpBuiltins$GetStaticRegExpResultNode;
            invokevirtual com.oracle.truffle.js.builtins.RegExpBuiltins$GetStaticRegExpResultNode.execute:()Ljava/lang/Object;
            astore 2 /* result */
        start local 2 // java.lang.Object result
         2: .line 305
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.resultAccessor:Lcom/oracle/truffle/js/runtime/util/TRegexUtil$TRegexResultAccessor;
            aload 2 /* result */
            invokevirtual com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexResultAccessor.isMatch:(Ljava/lang/Object;)Z
            ifeq 6
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.compiledRegexAccessor:Lcom/oracle/truffle/js/runtime/util/TRegexUtil$TRegexCompiledRegexAccessor;
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.getContext:()Lcom/oracle/truffle/js/runtime/JSContext;
            invokevirtual com.oracle.truffle.js.runtime.JSContext.getRealm:()Lcom/oracle/truffle/js/runtime/JSRealm;
            invokevirtual com.oracle.truffle.js.runtime.JSRealm.getStaticRegexResultCompiledRegex:()Ljava/lang/Object;
            invokevirtual com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexCompiledRegexAccessor.groupCount:(Ljava/lang/Object;)I
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.groupNumber:I
            if_icmple 6
         3: .line 306
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.resultAccessor:Lcom/oracle/truffle/js/runtime/util/TRegexUtil$TRegexResultAccessor;
            aload 2 /* result */
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.groupNumber:I
            invokevirtual com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexResultAccessor.captureGroupStart:(Ljava/lang/Object;I)I
            istore 3 /* start */
        start local 3 // int start
         4: .line 307
            iload 3 /* start */
            iflt 6
         5: .line 308
            aload 0 /* this */
            invokevirtual com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.getInput:()Ljava/lang/String;
            iload 3 /* start */
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.resultAccessor:Lcom/oracle/truffle/js/runtime/util/TRegexUtil$TRegexResultAccessor;
            aload 2 /* result */
            aload 0 /* this */
            getfield com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode.groupNumber:I
            invokevirtual com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexResultAccessor.captureGroupEnd:(Ljava/lang/Object;I)I
            invokestatic com.oracle.truffle.js.runtime.Boundaries.substring:(Ljava/lang/String;II)Ljava/lang/String;
            areturn
        end local 3 // int start
         6: .line 311
      StackMap locals: java.lang.Object
      StackMap stack:
            ldc ""
            areturn
        end local 2 // java.lang.Object result
        end local 1 // com.oracle.truffle.api.frame.VirtualFrame frame
        end local 0 // com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lcom/oracle/truffle/js/builtins/RegExpBuiltins$JSRegExpStaticResultGetGroupNode;
            0    7     1   frame  Lcom/oracle/truffle/api/frame/VirtualFrame;
            2    7     2  result  Ljava/lang/Object;
            4    6     3   start  I
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.dsl.Specialization()
    MethodParameters:
       Name  Flags
      frame  
}
SourceFile: "RegExpBuiltins.java"
NestHost: com.oracle.truffle.js.builtins.RegExpBuiltins
InnerClasses:
  abstract GetStaticRegExpResultNode = com.oracle.truffle.js.builtins.RegExpBuiltins$GetStaticRegExpResultNode of com.oracle.truffle.js.builtins.RegExpBuiltins
  abstract JSRegExpStaticResultGetGroupNode = com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultGetGroupNode of com.oracle.truffle.js.builtins.RegExpBuiltins
  abstract JSRegExpStaticResultPropertyNode = com.oracle.truffle.js.builtins.RegExpBuiltins$JSRegExpStaticResultPropertyNode of com.oracle.truffle.js.builtins.RegExpBuiltins
  public final TRegexCompiledRegexAccessor = com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexCompiledRegexAccessor of com.oracle.truffle.js.runtime.util.TRegexUtil
  public final TRegexResultAccessor = com.oracle.truffle.js.runtime.util.TRegexUtil$TRegexResultAccessor of com.oracle.truffle.js.runtime.util.TRegexUtil