use pattern to speed up getFormatValue()

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@15831 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/variant/VCFRecord.java

@@ -103,9 +103,7 @@ class VCFRecord
     }
     return rec;
   }
-  
 
-  
   /**
    * For example DP or MQ
    * @param key
@@ -127,7 +125,7 @@ class VCFRecord
     {
       if(fmts[i].equals(key))
       {
-        String vals[] = getSampleDataString().split(":");
+        String vals[] = COLON_PATTERN.split(getSampleDataString());
         if(vals.length == fmts.length)
           return vals[i];
       }