https://github.com/JetBrains/java-annotations: A set of annotations used for code inspection support and code documentation. 
public interface org.intellij.lang.annotations.Identifier extends java.lang.annotation.Annotation
  minor version: 0
  major version: 59
  flags: flags: (0x2601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT, ACC_ANNOTATION
  this_class: org.intellij.lang.annotations.Identifier
  super_class: java.lang.Object
{
}
SourceFile: "Identifier.java"
    RuntimeInvisibleAnnotations: 
      org.intellij.lang.annotations.Pattern(value = "\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*")