Processing Large Files in Java, Variation 3

ReadFileJavaApplicationBufferedReader.diff23.java

--- ReadFileJavaApplicationBufferedReader2.java
+++ ReadFileJavaApplicationBufferedReader3.java
@@ -44,6 +45,7 @@
        Instant commonNameStart = Instant.now();
        ArrayList<String> firstNames = new ArrayList<>();
 
+         var namePat = Pattern.compile(", \\s*(([^ ]*), |([^ ]+))");
 
          System.out.println("Reading file using " + Caller.getName());
 
@@ -55,20 +57,13 @@
                String name = array1[7].strip();
                names.add(name);
 
-               if(name.contains(", ")) {
-
-                       String array2[] = (name.split(", "));
-                       String firstHalfOfName = array2[1].trim();
-
-                       if (!firstHalfOfName.isEmpty()) {
-                               if (firstHalfOfName.contains(" ")) {
-                                       String array3[] = firstHalfOfName.split(" ");
-                                       String firstName = array3[0].trim();
-                                       firstNames.add(firstName);
-                               } else {
-                                       firstNames.add(firstHalfOfName);
-                               }
+                 var matcher = namePat.matcher(name);
+                 if (matcher.find()) {
+                     String s = matcher.group(2);
+                     if (s == null) {
+                         s = matcher.group(3);
                        }
+                     firstNames.add(s);
                }
 
                String rawDate = array1[4].strip();