title: Python Pandas - search for regex match in cells across all columns
body: <p>I have see  examples of how pandas dataframe can be filtered based on a match within a specific column.
  Can I further expand on the question where instead of searching within a specific column I am trying to find an efficient way to identify rows containing a specific regex matched value across all columns... Nested for loop is just way too inefficient - to the point where its faster to dump datatable into csv file and grepping it.</p>
  
  <p>There must be a more efficient native to pandas way to accomplish this?</p>
  
  <p>Thank you!</p>