make the ping stuff not crash immediately

[spider.git] / perl / DXUtil.pm

diff --git a/perl/DXUtil.pm b/perl/DXUtil.pm
index 9f411812d6b2207d02d34b2de7581af78fe4314f..468f225ffb6c33e65bcd4c9d4dabef8d282e54cf 100644 (file)
--- 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 +364,11 @@ 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
 {