Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

[Denis Bueno]

In GNU Emacs 22.1.50.2 (i386-apple-darwin8.9.1, Carbon Version 1.6.0) of
2007-07-06:

    1. emacs -Q
    2. Paste into *scratch*:

    7/6 09:28:35
    7/6 09:30:34

    3. M-x re-builder
    4. 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\)
    5. Observe that both lines have matching parts.
    6. Kill the *re-builder* buffer.
    7. M-x hi-lock-mode
    (Observe that the minibuffer says "Hi-lock mode enabled" but "Hi" is not
displayed in the modeline.  That's weird.)
    8. C-x w h 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\) RET RET
    9. Observe no highlighting.
    (Also "Hi" is now in the modeline.)

Thank you.

-Denis

Re: Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

[Richard Stallman]

Would someone please DTRT, then ack?

Re: Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

[David Koppelman]

Not a bug. The text in the re-builder buffer has '\' escaped (to
'\\'), for use as string value (literal?). The value expected by
highlight-regexp when reading from the minibuffer is the regexp
without escaping of backslashes.

The following would work:
 C-x w h 09[:]\(\(28\)\|\(29\)\|\(30\)\)


"Denis Bueno" <denbuen@sandia.gov> writes:

> In GNU Emacs 22.1.50.2 (i386-apple-darwin8.9.1, Carbon Version 1.6.0) of
> 2007-07-06:
>
>     1. emacs -Q
>     2. Paste into *scratch*:
>
>     7/6 09:28:35
>     7/6 09:30:34
>
>     3. M-x re-builder
>     4. 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\)
>     5. Observe that both lines have matching parts.
>     6. Kill the *re-builder* buffer.
>     7. M-x hi-lock-mode
>     (Observe that the minibuffer says "Hi-lock mode enabled" but "Hi" is not
> displayed in the modeline.  That's weird.)
>     8. C-x w h 09[:]\\(\\(28\\)\\|\\(29\\)\\|\\(30\\)\\) RET RET
>     9. Observe no highlighting.
>     (Also "Hi" is now in the modeline.)
>
> Thank you.
>
> -Denis

Re: Bug: Hi-lock-mode doesn't highlight regexp re-builder vets

[Detlev Zundel]

Hi Denis and David,

> Not a bug. The text in the re-builder buffer has '\' escaped (to
> '\\'), for use as string value (literal?). The value expected by
> highlight-regexp when reading from the minibuffer is the regexp
> without escaping of backslashes.

When I wrote re-builder I specifically included a re-builder "syntax"
(reb-re-syntax) governing the entry and display.  It defaults to 'read
being compatible with the elisp reader.  But you can reb-change-syntax
to 'string and get re-builder to interpret and display the regex as
you need it for a string input.

Cheers
  Detlev

-- 
 Those who do not understand Unix are condemned to reinvent it,
 poorly.
 - Henry Spencer, University of Toronto Unix hack