add more code gradually

[spider.git] / perl / DXUtil.pm

diff --git a/perl/DXUtil.pm b/perl/DXUtil.pm
index c633413e7bfa2a0fdef19fde66645dffcef91ce6..8ae43978a62dbbe4b39156dc6353034bcb284f59 100644 (file)
--- a/perl/DXUtil.pm
+++ b/perl/DXUtil.pm
@@ -17,7 +17,7 @@ use strict;
 
 use vars qw($VERSION $BRANCH);
 $VERSION = sprintf( "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/ );
-$BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/  || (0,0));
+$BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/,(0,0));
 $main::build += $VERSION;
 $main::branch += $BRANCH;
 
@@ -341,7 +341,13 @@ sub unpad
 # check that a field only has callsign characters in it
 sub is_callsign
 {
-       return $_[0] =~ /^(?:[A-Z]{1,2}\d+|\d[A-Z]{1,2}\d+)[A-Z]{1,3}(?:-\d{1,2}|\/(?:[A-Z]{1,2}\d{0,2}|\d[A-Z]\d{0,2}))?$/;
+       return $_[0] =~ m!^(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+)        # basic prefix
+                       (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another one (possibly)
+                                          [A-Z]{1,3}                                 # callsign letters
+                                          (?:/(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+))?  # / another prefix possibly
+                       (?:/[0-9A-Z]{1,2})?                        # /0-9A-Z+ possibly
+                                          (?:-\d{1,2})?                              # - nn possibly
+                                        $!x;
 }
 
 # check that a PC protocol field is valid text