Github user jodersky commented on the issue:

    https://github.com/apache/spark/pull/15398
  
    Thanks for the feedback. It was my plan to add the escape syntax in a 
separate PR. The main questions that I'm concerned with here are the points I 
enumerate in this PRs description, namely:
    
    - should spark allow ending patterns in the escape character?
    - how to handle empty input and/or patterns?
    - escaping "regular" characters?



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