U. Mutlu <for-gmane@mutluit.com> wrote:
the following regex expression works in perl-mode, but does not work in extented-mode.
It would help if you were more specific about what went wrong. Did the constructor throw an exception? Did the extended engine fail to match your input string? If so, what input text are you using?
I think I haven't used any perl-specific construct, or did I? Where?
I only use the Perl-compatible engine myself. I check the POSIX extended mode and did not see any obvious problems, though I did wonder about this:
#define WORD "[\\w\\-\\.~/]+"
I suspected that Perl would support the escape sequence \w inside a [] character set, but POSIX extended might not. The tests I ran affirmed those suspicions. I tested this regex in a Perl one-liner and it matched the input string "alpha only". I tried the same regex in egrep and it didn't work. egrep did match that input string when I replaced "\w" with "a-z". I find it much easier to program with regular expressions if I test them using a command-line tool first. |+| M a r k |+| Mark Stallard Business Application Services Global Business Services Information Technology Raytheon Company (business) 978-436-8487 (cell) 617-331-5443 stallard@raytheon.com 880 Technology Drive Billerica, MA 01821 www.raytheon.com This message contains information that may be confidential and privileged. Unless you are the addressee (or authorized to receive mail for the addressee), you should not use, copy or disclose to anyone this message or any information contained in this message. If you have received this message in error, please so advise the sender by reply e-mail and delete this message. Thank you for your cooperation. From: "U.Mutlu" <for-gmane@mutluit.com> To: boost-users@lists.boost.org Date: 02/12/2015 10:10 PM Subject: [Boost-users] [regex] problem w/ regex::extended Sent by: "Boost-users" <boost-users-bounces@lists.boost.org> Hi, the following regex expression works in perl-mode, but does not work in extented-mode. What's the reason? I think I haven't used any perl-specific construct, or did I? Where? ... #define NUM "[+-]?(\\d+\\.?\\d*|\\.\\d+)([eE][+-]?\\d+)?" #define WORD "[\\w\\-\\.~/]+" #define EQU "\\s*\\=\\s*" const string sUserRE_VarAndVal = WORD EQU NUM; #if 0 #define REGEX_ENGINE boost::regex::extended #else #define REGEX_ENGINE boost::regex::perl #endif regex reNum(sUserRE_VarAndVal, REGEX_ENGINE); ... _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users
