🚀 go-pugleaf

Hello.

I think there is a bug in 're-search-backward' function.

[System configuration]
Sun3/60 with SunOS3.5.  Emacs version is 18.55 compiled by Sun's compiler.

[Reproduction]
(1) Open a empty buffer (says foo); type two characters, SPACE and 'a'; move
    the cursor just on the character 'a'.

(2) Eval

      (re-search-backward "\\`\\|\\s ")

(3) Eval

      (match-data)

    and you will see (#<marker at 1 in foo> #<marker at 1 in foo> )

[Bug]
In 're-search-backward', not "\\`" but "\\s " should be matched.  But
'match-data' says that actual matching is "\\'".

If "\\s " were matched correctly, 'match-data' would say
(#<marker at 1 in foo> #<marker at 2 in foo> ).

[Appendix]
(re-search-backward "\\s \\|\\'") works fine.



Thank you.

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---
S.Sugou