class_docstr: The :class:`RegexPattern` class is an implementation of a pattern using
  regular expressions.
class_docstr_tok: ["The",":","class",":","`","RegexPattern","`","class","is","an","implementation","of","a","pattern","using","regular","expressions","."]
docstr: Matches this pattern against the specified file.
  
  *file* (:class:`str`) contains each file relative to the root directory
  (e.g., "relative/path/to/file").
  
  Returns the match result (:class:`.RegexMatchResult`) if *file* matched;
  otherwise, :data:`None`.
docstr_tok: ["Matches","this","pattern","against","the","specified","file",".","*","file","*","(",":","class",":","`","str","`",")","contains","each","file","relative","to","the","root","directory","(","e.g.",",","``","relative\/path\/to\/file","''",")",".","Returns","the","match","result","(",":","class",":","`",".RegexMatchResult","`",")","if","*","file","*","matched",";","otherwise",",",":","data",":","`","None","`","."]
code: def match_file(self, file: str) -> Optional["RegexMatchResult"]:
      """
      Matches this pattern against the specified file.
  
      *file* (:class:`str`) contains each file relative to the root directory
      (e.g., "relative/path/to/file").
  
      Returns the match result (:class:`.RegexMatchResult`) if *file* matched;
      otherwise, :data:`None`.
      """
      if self.include is not None:
          match = self.regex.match(file)
          if match is not None:
              return RegexMatchResult(match)
  
      return None
  
file_path: catboost/contrib/python/pathspec/pathspec/pattern.py
imports: import dataclasses
  import re
  import warnings
  from typing import Any, AnyStr, Iterable, Iterator, Match, Optional, Pattern, Tuple, Union
label_desc: Use image node_id 3 for calling the RegexPattern obj's underlying member method code with example usage: obj.match_file(file) and returns: None, RegexMatchResult