From 13fe6ec4886828e729b9e3e9a1423ea6fa117fc7 Mon Sep 17 00:00:00 2001
From: Christian Jacobs <c.jacobs10@imperial.ac.uk>
Date: Fri, 29 Mar 2013 02:32:39 +0000
Subject: [PATCH] Validation for the FREQ field using a regular expression.

---
 src/record_dialog.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/record_dialog.py b/src/record_dialog.py
index cc1e0cb..790f6ec 100644
--- a/src/record_dialog.py
+++ b/src/record_dialog.py
@@ -20,6 +20,7 @@
 
 from gi.repository import Gtk, GObject
 import logging
+import re
 
 from callsign_lookup import *
 
@@ -146,7 +147,14 @@ class RecordDialog(Gtk.Dialog):
 
    def is_valid(self, field_name, data):
       if(field_name == "FREQ"):
-         return True
+         if(data != ""):
+            # Allow a decimal point before and/or after any numbers,
+            # but don't allow a decimal point on its own.
+            m = re.match("([0-9]+\.?[0-9]*)|([0-9]*\.?[0-9]+)", data)
+            if(m is not None):
+               return (m.group(0) == data)
+         else:
+            return True
 
       else:
          return True