code: def _filter_mainline_versions(self, versions):
      if self.project == "PARQUET":
          mainline_regex = re.compile(r"cpp-\d.*")
      else:
          mainline_regex = re.compile(r"\d.*")
  
      return [x for x in versions if mainline_regex.match(x.name)]
  
imports: import configparser
  import os
  import pprint
  import re
  import subprocess
  import sys
  import requests
  import getpass
  from six.moves import input
  import six
label_desc: Use image node_id 4 for calling the JiraIssue obj's underlying member method code with example usage: obj._filter_mainline_versions(versions) and returns: unknown