X-Git-Url: http://www.dxcluster.org/gitweb/gitweb.cgi?p=spider.git;a=blobdiff_plain;f=perl%2FDXUtil.pm;h=705e5cc6c6eb02bdae3acf8eb003889182645205;hp=c633413e7bfa2a0fdef19fde66645dffcef91ce6;hb=e07645cec07ba739a20cc009d7dd138c962b66eb;hpb=90a05bee744c82d66ffdd0a0548b2ae97d7dfb56

diff --git a/perl/DXUtil.pm b/perl/DXUtil.pm
index c633413e..705e5cc6 100644
--- a/perl/DXUtil.pm
+++ b/perl/DXUtil.pm
@@ -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