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68576Re: Patch: Make :vimgrep // * reuse the last search pattern

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  • Bram Moolenaar
    Mar 5, 2013
    • 0 Attachment
      David B├╝rgin wrote:

      > The commands :s//string/, :g//, and :sort // all use the last search
      > pattern when an empty pattern is given. :vimgrep // *, however, does
      > not.
      >
      > The attached patch makes :vimgrep // * behave like the other search
      > commands.
      >
      > Details
      > -------
      >
      > Trying and refining a search pattern and then using it with :s//string/
      > and :g// is a common editing pattern in Vim. But this doesn't work with
      > :vimgrep. Surprisingly, :vimgrep // * matches *everywhere*.
      >
      > Why does it match everywhere? Regdump() output shows that "//" is
      > compiled to the following regexp:
      >
      > regcomp():
      > 1:BRANCH(7)
      > 4:NOTHING(7)
      > 7:END(0)
      >
      > All Vim puts in the compiled regexp program is a zero-width NOTHING
      > atom. NOTHING doesn't assert anything and matches the empty string, i.e.
      > everywhere (like :vimgrep /\ze/ *).
      >
      > As far as I am aware, this behaviour is not documented. At least for
      > :vimgrep it doesn't serve any purpose. (In fact, I can't think of any
      > situation where a completely empty regexp would be appropriate.)
      >
      > The attached patch makes :vimgrep reuse the last search pattern, in the
      > same way :g and :s do (and :sort).

      Thanks!

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