code: def is_escaped_code_start(line, ext):
      """Is the current line a possibly commented code start marker?"""
      return _ESCAPED_CODE_START[ext].match(line)
  
file_path: jupytext/src/jupytext/magics.py
imports: import re
  from .languages import _COMMENT, _SCRIPT_EXTENSIONS, usual_language_name
  from .stringparser import StringParser
label_desc: Use image node_id 7 for calling a global function with example usage: is_escaped_code_start(line, ext) and returns: _ESCAPED_CODE_START