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digitalmars.D.bugs - [Issue 1249] New: regular expression pattern [.] not matches any character

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1249

           Summary: regular expression pattern [.] not matches any character
           Product: D
           Version: 1.014
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: yidabu gmail.com


regular expression pattern [.] not matches any character
        The following code shows it:


                import std.regexp;
                import std.stdio;
                void main()
                {
                        char[] s = "a
                                b";
                        char[] p = "[.]+";
                        s = std.regexp.sub(s, p, "");
                        writefln("s=%s,",s);  // s not changed
                }


--
May 26 2007
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1249






I think '.' and other special characters  lose their special meaning inside a
character class.  So [.()$^] should match either a period, a paren, a
dollar-sign, or a caret, and nothing else.  If it's not documented as such then
maybe this is a documentation needs to make that clear.  That sort of behavior
is pretty common of regexp implementations.  Why would you want to put a 'match
any character' symbol inside a 'match any of these characters' construct.  [.]
would mean the same thing as a plain period.


--
May 26 2007
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1249







 Why would you want to put a 'match
 any character' symbol inside a 'match any of these characters' construct.  [.]
 would mean the same thing as a plain period.


since . not match newline, I try [.\s] to match anything, but failed. the only
way is (.|\s)

PCRE:
Note that special characters do not retain their special meanings inside [],
with the exception of \\, \^, \-,\[ and \] match the escaped character inside a
set.


--
May 27 2007
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1249








 I think '.' and other special characters  lose their special meaning inside a
 character class.  So [.()$^] should match either a period, a paren, a
 dollar-sign, or a caret, and nothing else.


You are rigth, but actually ^ must be escaped: [.()$\^]. And IMHO this is not a
bug. One can discuss but most of regular expression eninges also does so.


--
Jun 21 2007
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=1249


bugzilla digitalmars.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID





Works as designed.


--
Jun 28 2007