class_docstr: Lookahead expression.
class_docstr_tok: ["Lookahead","expression","."]
code: def __init__(self, childnode: Node, negative: bool = False) -> None:
      self.childnode = childnode
      self.negative = negative
  
imports: from __future__ import annotations
  import re
label_desc: Use image node_id 1 to create a new Lookahead object from inherited base classes: Node with example: obj = Lookahead(childnode, negative)