From 5ee35d49b3b1078cc824894945e00e392c2b2e84 Mon Sep 17 00:00:00 2001
From: minima <minima>
Date: Sun, 27 Feb 2005 16:00:26 +0000
Subject: [PATCH] add is_prefix and then use it

---
 perl/DXUtil.pm | 7 +++++++
 perl/Spot.pm   | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/perl/DXUtil.pm b/perl/DXUtil.pm
index 9f411812..927df28b 100644
--- a/perl/DXUtil.pm
+++ b/perl/DXUtil.pm
@@ -30,6 +30,7 @@ require Exporter;
 			 filecopy ptimelist
              print_all_fields cltounix unpad is_callsign is_latlong
 			 is_qra is_freq is_digits is_pctext is_pcflag insertitem deleteitem
+			 is_prefix
             );
 
 
@@ -363,6 +364,12 @@ sub is_callsign
 					 $!x;
 }
 
+sub is_prefix
+{
+	return $_[0] =~ m!^(?:[A-Z]{1,2}\d+ | \d[A-Z]{1,2}\d+)!x        # basic prefix
+}
+	
+
 # check that a PC protocol field is valid text
 sub is_pctext
 {
diff --git a/perl/Spot.pm b/perl/Spot.pm
index 0ab1a516..22880485 100644
--- a/perl/Spot.pm
+++ b/perl/Spot.pm
@@ -335,7 +335,7 @@ sub dup
 	$text =~ s/\%([0-9A-F][0-9A-F])/chr(hex($1))/eg;
 	$text = uc unpad($text);
 	my ($prefix) = $text =~ /\b(\w{1,4})$/;
-	$text =~ s/\b\w{1,4}$// if $prefix && Prefix::extract($prefix);
+	$text =~ s/\b\w{1,4}$// if $prefix && is_prefix($prefix);
 	$text = substr($text, 0, $duplth) if length $text > $duplth; 
 	$text = pack("C*", map {$_ & 127} unpack("C*", $text));
 	$text =~ s/[^\w]//g;
-- 
2.43.0