[gnu.emacs.bug] regexps unnatural feature in Emacs-18.55

shin@sgtp.apple.juice.or.jp (Shinichirou Sugou) (12/30/89)

Hello.

The following two functions both succeed.

    (re-search-backward "\\`^")
    (re-search-backward "^\\`")

In the combination of "\\'" and "$",

    (re-search-forward "\\'$")

succeeds, but

    (re-search-forward "$\\'")

fails.

I think this feature being unnatural since it is not symmetric.

[Proposal]

(1) It seems that beginning-of-buffer/end-of-buffer points far away than
    beginning-of-line/end-of-line.  So, following two functions must succeed

       (re-search-backward "\\`^")
       (re-search-forward  "$\\'")

    while following fail.

       (re-search-backward "^\\`")
       (re-search-forward  "\\'$")

(2) Or, every function must succeed.

       (re-search-backward "\\`^")
       (re-search-backward "^\\`")
       (re-search-forward  "$\\'")
       (re-search-forward  "\\'$")

Thank you.

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---
S.Sugou