RE: count of matches
Try:
#!/usr/bin/perl -w
use strict;
$_ = "ABabcde12345BAABabcde1234blahblah5BA";
print "is: ", $_ , "\n";
my $count = () = $_=~ /(AB.*?BA)/g;
my @match = /(AB.*?BA)/g;
print "match: ", join(", ", @match), "\n";
print "I matched $count times\n";
The trick is:
$_ =~ /../
applies the pattern to the string and returns a list of the 2 matches (due
to the parens inside the RE). The same thing as:
The empty parens supply the "list context" to the match, and then the
assignment to $count puts that list into scalar context, akin to:
my @match = $_ =~ /(AB.*?BA)/g;
my $count = @match;
or:
print "I matched ", scalar @match, " times\n";
Okay, I'm a little shakey on the fact that, the empty parens seem to
accept the list of return values (anonymous list, akin to an anon. array
[] ?) and then act like an array (as:
my $count = ('ABabcde12345BA', 'ABabcde1234blahblah5BA');
differs from:
my $count = @match;
in that the former assigns the final element of the list to $count, the
later assigns the # of elements) but that's the case and thats how the
matchbox gets opened and counted.
a
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RE: count of matches
> You can also use this bizarre construction to capture just the count: > > $_ = "ABabcde12345BAABabcde1234blahblah5BA"; > $count = () = $_=~ /(AB.*?BA)/g; > print "I matched $count times\n"' > > the () between the two ='s forces the match to list context, and then > THAT is forced to scalar context by setting it to $count. Whee! That can't possibly work. There's no command to open the matchbox, so how can you count the matches? Sorry, last day of work for the year. R. ___ Perl-Win32-Users mailing list Perl-Win32-Users@listserv.ActiveState.com To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
Re: count of matches
You can also use this bizarre construction to capture just the count: $_ = "ABabcde12345BAABabcde1234blahblah5BA"; $count = () = $_=~ /(AB.*?BA)/g; print "I matched $count times\n"' the () between the two ='s forces the match to list context, and then THAT is forced to scalar context by setting it to $count. Whee! ___ Perl-Win32-Users mailing list Perl-Win32-Users@listserv.ActiveState.com To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
RE: count of matches
> How do I get a count of the number of matches a regex finds within a string? > > example: > > $_ = "ABabcde12345BAABabcde1234blahblah5BA"; > print $1 if /(AB.*?BA)/ ; > > Ultimate goal is to separate with \n. > > Terry Try this: $string = "ABabcde12345BAABabcde1234blahblah5BA"; $count = $string =~ s/(?<=AB)(.*?)(?=BA)/$&/g ; print "Count = $count\n"; I believe you can also use tr to count matches... -Erich- ___ Perl-Win32-Users mailing list [EMAIL PROTECTED] To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
RE: count of matches
=~ m//g returns the number of matches if evaluated in list context so... $_ = "ABabcde12345BAABabcde1234blahblah5BA"; print $1 if /(AB.*?BA)/ ; becomes $_ = "ABabcde12345BAABabcde1234blahblah5BA"; @count=$_=~/(AB.*?BA)/g; print "I matched " . scalar @count . " times\n"; If you don't use the /g modifier it will only match once. Kind regards, Mark Anderson Service Improvement Project Level 2, 113 Dundas Street Edinburgh, EH3 5DE Tel: 0131 523 8786 Mob: 07808 826 063 > -Original Message- > From: vaughnte [SMTP:[EMAIL PROTECTED] > Sent: Wednesday, December 22, 2004 11:10 AM > To: [EMAIL PROTECTED] > Subject: count of matches > > *** WARNING : This message originates from the Internet *** > > > Howdy all, > > How do I get a count of the number of matches a regex finds within a > string? > > example: > > $_ = "ABabcde12345BAABabcde1234blahblah5BA"; > print $1 if /(AB.*?BA)/ ; > > Ultimate goal is to separate with \n. > > Terry > > ___ > Perl-Win32-Users mailing list > [EMAIL PROTECTED] > To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs The Royal Bank of Scotland plc, Registered in Scotland No. 90312. Registered Office: 36 St Andrew Square, Edinburgh EH2 2YB The Royal Bank of Scotland plc is authorised and regulated by the Financial Services Authority and represents The Royal Bank of Scotland Marketing Group. The Bank sells life policies, collective investment schemes and pension products and advises only on the Marketing Group's range of these products and on a With-Profit Bond produced by Norwich Union Life (RBS) Limited. This e-mail message is confidential and for use by the addressee only. If the message is received by anyone other than the addressee, please return the message to the sender by replying to it and then delete the message from your computer. Internet e-mails are not necessarily secure. The Royal Bank of Scotland plc does not accept responsibility for changes made to this message after it was sent. Whilst all reasonable care has been taken to avoid the transmission of viruses, it is the responsibility of the recipient to ensure that the onward transmission, opening or use of this message and any attachments will not adversely affect its systems or data. No responsibility is accepted by The Royal Bank of Scotland plc in this regard and the recipient should carry out such virus and other checks as it considers appropriate. ___ Perl-Win32-Users mailing list [EMAIL PROTECTED] To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
