Re: Regex help
See the codes below. The trick here is that $& is an special var used to capture the total match string. So in this case, the /[$&]/ regexp literal is equal to / [.type=xmlrpc&]/. #!/bin/perl $url = 'http://abc.com/test.cgi?TEST=1&.type=xmlrpc&type=2'; ($r1) = $url =~ /\.type=(.+?)(&|$)/; print "\$&=$&\n"; ($r2) = $url =~ /\.type=(.+?)[$&]/; print "\$r1=$r1\n\$r2=$r2\n" __DATA__ $&=.type=xmlrpc& $r1=xmlrpc $r2=x -Todd -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Regex help
On Saturday 24 November 2007 22:59, Todd wrote: > See the codes below. The trick here is that $& is an special var used > to capture the total match string. > So in this case, the /[$&]/ regexp literal is equal to / > [.type=xmlrpc&]/. Right. And that is a character class which says to match *one* character, either '.' or '=' or '&' or 'c' or 'e' or 'l' or 'm' or 'p' or 'r' or 't' or 'x' or 'y'. > #!/bin/perl > $url = 'http://abc.com/test.cgi?TEST=1&.type=xmlrpc&type=2'; > ($r1) = $url =~ /\.type=(.+?)(&|$)/; > print "\$&=$&\n"; > ($r2) = $url =~ /\.type=(.+?)[$&]/; > > print "\$r1=$r1\n\$r2=$r2\n" > > __DATA__ > $&=.type=xmlrpc& > $r1=xmlrpc > $r2=x Which is why $r2=x because (.+?) matches the 'x' after '.type=' and [.type=xmlrpc&] matches the 'm' after '.type=x'. Also, using $& (or $` or $') slows down all regular expressions in the program. John -- use Perl; program fulfillment -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
webcrawler - a concise idea but I need a little help.
Hi.
I have got a little bit more serious idea than my last one, as an
enthusiatisk chess player I would like if I could download a lot of .pgn
files from the web.
But I don't how to do some pseudo code could be like
open_internet_connection
{
open_some_site
search(*.pgn)
download(*.pgn)
}
but this should be done on a whole bunch of files.
- btw. Just give me a hint on what sort of modules I need I can read and
learn myself.
or better yet where is there a decent search page for cpan ?
Can't find any.
Greetings Denmark
Re: webcrawler - a concise idea but I need a little help.
On 11/25/07, Tobias L <[EMAIL PROTECTED]> wrote:
> But I don't how to do some pseudo code could be like
>
>
> open_internet_connection
> {
> open_some_site
> search(*.pgn)
> download(*.pgn)
> }
Sounds like you want WWW::Mechanize.
http://search.cpan.org/dist/WWW-Mechanize/
> or better yet where is there a decent search page for cpan ?
Besides search.cpan.org? What do you find if you type "search cpan"
into your favorite search engine?
Cheers!
--Tom Phoenix
Stonehenge Perl Training
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Date and Time and Function calls
Hello I am looking for a perl function or functions that will give me the date and time. I am going to use the results to create a unique file name. Andrew -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Date and Time and Function calls
time will give you the number of seconds since the epoch. This is good so long as you don't expect to create two files in one second. http://perldoc.perl.org/functions/time.html "For measuring time in better granularity than one second, you may use either the Time::HiRes module (from CPAN, and starting from Perl 5.8 part of the standard distribution)" http://perldoc.perl.org/perlfaq8.html#How-can-I-measure-time-under-a-second%3f An alternative might be to get a random number, and use that. On Nov 24, 2007 11:44 AM, AndrewMcHorney <[EMAIL PROTECTED]> wrote: > Hello > > I am looking for a perl function or functions that will give me the > date and time. I am going to use the results to create a unique file name. > > Andrew -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Date and Time and Function calls
On 11/24/07, AndrewMcHorney <[EMAIL PROTECTED]> wrote: > I am looking for a perl function or functions that will give me the > date and time. Are you looking in the perlfunc manpage? Type 'perldoc perlfunc' at a prompt (or into your favorite search engine) to get started. > I am going to use the results to create a unique file name. Even if you have the time to the second, there may be another process active during the same second. One common and easy way to do what I think you want is to include the process ID (PID) and some small string (such as your program name), along with $^T as as the time. Even though process IDs are eventually reused, the process ID is a unique value while the program runs. If my program were named fred, I might use something like this: my $unique_file_name = "fred.$^T.$$"; Perl's special variables, such as $$ and $^T, are documented in the perlvar manpage. Cheers! --Tom Phoenix Stonehenge Perl Training -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Date and Time and Function calls
AndrewMcHorney <[EMAIL PROTECTED]> writes: > Hello > > I am looking for a perl function or functions that will give me the > date and time. I am going to use the results to create a unique file > name. There are many posibilities depending on uniqueness, this is quite similar: $randnum = 1000 + int rand(9000); $filename = time.'_'.$randnum; -- Radek -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
Re: Date and Time and Function calls
rahed schreef:
> AndrewMcHorney:
>> I am looking for a perl function or functions that will give me the
>> date and time. I am going to use the results to create a unique file
>> name.
>
> There are many posibilities depending on uniqueness,
> this is quite similar:
>
> $randnum = 1000 + int rand(9000);
> $filename = time.'_'.$randnum;
You could put that inside a "while (1) {}",
that also contains a "-e $filename or last;",
but even then you would still risk a race condition.
--
Affijn, Ruud
"Gewoon is een tijger."
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Re: Date and Time and Function calls
Hi Andrew, I would suggest http://search.cpan.org/~tjenness/File-Temp-0.19/Temp.pm HTH Martin On Sat, 24 Nov 2007 08:44:18 -0800 AndrewMcHorney <[EMAIL PROTECTED]> wrote: > Hello > > I am looking for a perl function or functions that will give me the > date and time. I am going to use the results to create a unique file name. > > Andrew -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/
perl_eval_pv function crashing when creating Perl subroutine from a char string in CPP program
Hi,
I am trying to create Perl subroutine in my C++ program, source code of which
is given below -- attempt to embed Perl in C++ program.
I cannot use the perl script file for this because the expressions to be
evaluated are stored in database & are to be loaded at runtime.
This program compiles fine. Command line for that is also given.
But, program crashes when it calls perl_eval_pv function. When I ran it in GDB,
I got this back trace.
May I please know:
1) Is this correct way to create Perl subroutines in embedded Perl in C?
2) Why is this program is crashing when perl_eval_pv?
A) How to resolve this problem of crash?
-- should I link any more library or compile the Perl on my machine?
Please help.
Thanks in advance for help & guidance.
Regards,
Ganesh
Compilation command:
g++ -g3 -ggdb -Dbool=char -DHAS_BOOL
-I/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE
-L/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE -L/usr/lib -L. -lperl -lm
-lnsl -lgdbm -ldb -ldl -lpthread -lc -lcrypt -lutil testeval.cpp
rpm -qf /usr/bin/perl
perl-5.8.0-88.4
Program source code:
#include
#include
static PerlInterpreter *my_perl;
main()
{
my_perl = perl_alloc();
perl_construct(my_perl);
char peExpr[] =\
"sub isSizeSmall($size,$vol,$ADV,$prod)\n"\
"{\n"\
"my ($size,$vol,$ADV,$prod) = @_;\n"\
"if ( ($size < 1000) && ($vol < (0.001 * $ADV)) && ($prod =~ m/Stock/)){\n"\
" return 10;\n"\
" } else {\n"\
" return 11;\n"\
" }\n"\
"}\n";
printf("expression: \n[%s]\n",peExpr);
// Parse this subroutine & add to interpreter
perl_eval_pv(peExpr,TRUE);
// now call this subroutine with 4 input arguments in an array
char *peArgs[] = { "100","1000","10","\"Stock\""};
perl_call_argv("isSizeSmall",G_ARRAY,peArgs);
perl_destruct(my_perl);
perl_free(my_perl);
}
Gdb backtrace output when the program got SIGSEGV:
LD_LIBRARY_PATH=/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE:$LD_LIBRARY_PATH
Using host libthread_db library "/lib/tls/libthread_db.so.1".
(gdb) run
Starting program: /home/gborse/prgs/bakup/perl/a.out
[Thread debugging using libthread_db enabled]
[New Thread -1223159680 (LWP 23628)]
expression:
[sub isSizeSmall($size,$vol,$ADV,$prod)
{
my ($size,$vol,$ADV,$prod) = @_;
if ( ($size < 1000) && ($vol < (0.001 * $ADV)) && ($prod =~ m/Stock/)){
return 10;
} else {
return 11;
}
}]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1223159680 (LWP 23628)]
0xb757fa90 in S_doeval (my_perl=0x8049c48, gimme=0, startop=0x0) at
pp_ctl.c:2774
2774pp_ctl.c: No such file or directory.
in pp_ctl.c
Current language: auto; currently c
(gdb) bt
#0 0xb757fa90 in S_doeval (my_perl=0x8049c48, gimme=0, startop=0x0) at
pp_ctl.c:2774
#1 0xb7581412 in Perl_pp_entereval (my_perl=0x8049c48) at pp_ctl.c:3353
#2 0xb74e678f in S_call_body (my_perl=0x8049c48, myop=0xbfffa370, is_eval=1)
at perl.c:2064
#3 0xb74e69d2 in Perl_eval_sv (my_perl=0x8049c48, sv=0x0, flags=0) at
perl.c:2129
#4 0xb74e6c1a in Perl_eval_pv (my_perl=0x8049c48, p=0x0, croak_on_error=1) at
perl.c:2188
#5 0x08048804 in main () at testeval.cpp:31
(gdb)
//-
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