Re: [boost] [libboost_regex-1_32.dylib] Validating Email address usingRegx failing in boost

Subject: Re: [boost] [libboost_regex-1_32.dylib] Validating Email address usingRegx failing in boost
From: Arun (arun.ka_at_[hidden])
Date: 2009-10-22 12:38:50

Hi John,
Thanks for u r reply.

I am using the code as below.

bool testRegExMatch(std::string aRegex, std::string aTestString)
{
        boost::regex regExpr(aRegex);
        
        if(regex_match(aTestString,regExpr)==false)
        {
                return false;
        }
        
        return true;
}

bool validateEmailAddressWithRegx(std::string aEmailAddressStr)
{
        std::string expr("^((?>[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+\\x20*|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\"\\x20*)*(?<angle><))?((?!\\.)(?>\\.?[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+)+|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\")@(((?!-)[a-zA-Z\\d\\-]+(?<!-)\\.)+[a-zA-Z]{2,}|\\[(((?(?<!\\[)\\.)(25[0-5]|2[0-4]\\d|[01]?\\d?\\d)){4}|[a-zA-Z\\d\\-]*[a-zA-Z\\d]:((?=[\\x01-\\x7f])[^\\\\\\[\\]]|\\\\[\\x01-\\x7f])+)\\])(?(<angle>)>)$");
        
        cout<<expr;
        
        return testRegExMatch(expr, aEmailAddressStr);
}

^((?>[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+\x20*|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*"\x20*)*(?<angle><))?((?!\.)(?>\.?[a-zA-Z\d!#$%&'*+\-/=?^_`{|}~]+)+|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*")@(((?!-)[a-zA-Z\d\-]+(?<!-)\.)+[a-zA-Z]{2,}|\[(((?(?<!\[)\.)(25[0-5]|2[0-4]\d|[01]?\d?\d)){4}|[a-zA-Z\d\-]*[a-zA-Z\d]:((?=[\x01-\x7f])[^\\\[\]]|\\[\x01-\x7f])+)\])(?(<angle>)>)$
[Session started at 2009-10-22 22:02:58 +0530.]
terminate called after throwing an instance of 'boost::bad_expression'
  what():  Invalid preceding regular expression

Any thing i am missing

-Arun

But still i am getting the output as

On Thu, Oct 22, 2009 at 9:35 PM, John Maddock <john_at_[hidden]> wrote:
>> I am using boost regex libraries (libboost_regex-1_32.dylib) for
>> validation of strings. The regular expression string i use is as
>> below.
>>
>> string expr =
>> "^((?>[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+\\x20*|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\"\\x20*)*(?<angle><))?((?!\\.)(?>\\.?[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+)+|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\")@(((?!-)[a-zA-Z\\d\\-]+(?<!-)\\.)+[a-zA-Z]{2,}|\\[(((?(?<!\\[)\\.)(25[0-5]|2[0-4]\\d|[01]?\\d?\\d)){4}|[a-zA-Z\\d\\-]*[a-zA-Z\\d]:((?=[\\x01-\\x7f])[^\\\\\\[\\]]|\\\\[\\x01-\\x7f])+)\\])(?(angle)>)$";
>>
>> When i make a call
>>
>> boost::regex regExpr(expr);
>>
>> it is throwing  what():  Invalid preceding regular expression.
>
> Sigh... I *really* need to improve those error messages :-(
>
> I tried the expression in Perl and got an error as well:
>
> $in = 'name.surname_at_[hidden]';
> $in =~
> /^((?>[a-zA-Z\d!#$%&'*+\-\/=?^_`{|}~]+\x20*|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*"\x20*)*(?<angle><))?((?!\.)(?>\.?[a-zA-Z\d!#$%&'*+\-\/=?^_`{|}~]+)+|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*")@(((?!-)[a-zA-Z\d\-]+(?<!-)\.)+[a-zA-Z]{2,}|\[(((?(?<!\[)\.)(25[0-5]|2[0-4]\d|[01]?\d?\d)){4}|[a-zA-Z\d\-]*[a-zA-Z\d]:((?=[\x01-\x7f])[^\\\[\]]|\\[\x01-\x7f])+)\])(?(angle)>)$/;
> print "\n";
>  print "\$& = $&\n";
>  print "\$1 = $1\n";
>  print "\$2 = $2\n";
>  print "\$3 = $3\n";
>  print "\$4 = $4\n";
>  print "\$5 = $5\n";
>  print "\$6 = $6\n";
>  print "\$7 = $7\n";
>  print "\$8 = $8\n";
>
> Prints:
>
> Unknown switch condition (?(an in regex; marked by <-- HERE in
> m/^((?>[a-zA-Z\d!#0&'*+\-/=?^_`{|}~]+\x20*|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*"\x20*)*(?<angle><))?((?!\.)(?>\.?[a-zA-Z\d!#0&'*+\-/=?^_`{|}~]+)+|"((?=[\x01-\x7f])[^"\\]|\\[\x01-\x7f])*")@(((?!-)[a-zA-Z\d\-]+(?<!-)\.)+[a-zA-Z]{2,}|\[(((?(?<!\[)\.)(25[0-5]|2[0-4]\d|[01]?\d?\d)){4}|[a-zA-Z\d\-]*[a-zA-Z\d]:((?=[\x01-\x7f])[^\\\[\]]|\\[\x01-\x7f])+)\])(?(
> <-- HERE angle)>)$/ at test.pl line 3.
>
> So Perl and Boost.Regex are both rejecting the "(?(angle)>)" part, and
> looking at http://perldoc.perl.org/perlre.html I believe it should be
> rejected.  It appears this is a .NET-specific construct :-(
>
> Changing to "(?(<angle>)>)" seems to make everything work though, in code:
>
>  boost::regex test (
> "^((?>[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+\\x20*|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\"\\x20*)*(?<angle><))?((?!\\.)(?>\\.?[a-zA-Z\\d!#$%&'*+\\-/=?^_`{|}~]+)+|\"((?=[\\x01-\\x7f])[^\"\\\\]|\\\\[\\x01-\\x7f])*\")@(((?!-)[a-zA-Z\\d\\-]+(?<!-)\\.)+[a-zA-Z]{2,}|\\[(((?(?<!\\[)\\.)(25[0-5]|2[0-4]\\d|[01]?\\d?\\d)){4}|[a-zA-Z\\d\\-]*[a-zA-Z\\d]:((?=[\\x01-\\x7f])[^\\\\\\[\\]]|\\\\[\\x01-\\x7f])+)\\])(?(<angle>)>)$"
> );
>
> HTH, John.
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost
>