Whats the difference between sed -E and sed -e

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From source code, -E is an undocumented option for compatibility with BSD sed.

/* Undocumented, for compatibility with BSD sed.  */
case 'E':
case 'r':
  if (extended_regexp_flags)
    usage(4);
  extended_regexp_flags = REG_EXTENDED;
  break;

And from manual, -E in BSD sed is used to support extended regular expressions.

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