regression matrix changes

Author: nofa

src/main/java/com/jdoe/algorithms/BuildRegressionMatrix.java

@@ -0,0 +1,20 @@
+package com.jdoe.algorithms;
+
+import java.util.ArrayList;
+import java.util.List;
+
+//Build a regression matrix using a DOE matrix and a list of monomials.
+public class BuildRegressionMatrix {
+
+    public static List< Integer > grep ( String pattern, String data ) {
+        String[] dataArray = data.split( "" );
+        List< Integer > occouranceIndexes = new ArrayList<>();
+        for ( int i = 0; dataArray.length > i; i++ ) {
+            if ( data.substring( i, i + pattern.length() ).equalsIgnoreCase( pattern ) ) {
+                occouranceIndexes.add( i );
+            }
+        }
+        return occouranceIndexes;
+    }
+
+}