def _is_valid_table(config_value):
return re.match(<EOL>r'<STR_LIT>'<EOL>+ RE_PROJECT  <EOL>+ r'<STR_LIT>'  <EOL>+ RE_DS_TABLE  <EOL>+ r'<STR_LIT>'  <EOL>+ RE_DS_TABLE  <EOL>+ r'<STR_LIT>'  <EOL>+ RE_DS_TABLE  <EOL>+ r'<STR_LIT>'  <EOL>+ RE_DS_TABLE  <EOL>+ r'<STR_LIT:$>',<EOL>config_value,<EOL>)<EOL>
Tables must be of form "project.dataset.table" or "dataset.table"