Tom Lane wrote:
> AFAICS, getting SIMILAR TO to operate per spec would require adding some
> sort of translation function that converts the spec-style pattern into
> a Posix pattern that our regex match engine would handle.  This would at
> least require adding ^ and $ around the pattern, converting the escape
> character if any, and translating % and _ into .* and . respectively.
> There are probably some differences of detail that we'd need to fix
> later, but that would get it to a state where we need not be ashamed
> to release it.
> We already have a similar mechanism for handling LIKE ... ESCAPE
> clauses, so it doesn't seem too difficult to do.  But I haven't got
> time for it...

It seems like a merge of regex and LIKE patterns.  ANSI doesn't have
regex so maybe SIMILAR TO is their solution to that.

  Bruce Momjian                        |
  [EMAIL PROTECTED]               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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