--- a
+++ b/assoc_rules/ProcRules.java
@@ -0,0 +1,89 @@
+package assoc_rules;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * This class provides methods for processing mined association rules
+ * @author zhengc
+ *
+ */
+public class ProcRules {
+
+	public static void main(String[] args) throws IOException {
+
+		/* Command line arguments*/
+		String rules = args[0];
+		String out = args[1];
+		String category = args[2];
+		
+		BufferedReader br = new BufferedReader(new FileReader(new File(rules)));
+		BufferedWriter bw = new BufferedWriter(new FileWriter(new File(out)));
+		
+		// Writer header line
+		String header = category + "_1" + "|" + "Support_1 " + "|" + category + "_2" + "|" +"Support_2" + "|" +
+		"Confidence" + "|" + "Lift" + "|" + "Leverage" + "|" + "Conviction" + "\n";
+		bw.write(header);
+		
+		/* The following codes parse association rules from weka FPGrowth output 
+		 * into easy handled format for downstream analysis 
+		 * It takes several steps
+		 */
+		String line = br.readLine();
+		//System.out.println(line);
+		line = br.readLine();
+		//System.out.println(line);
+		while ((line = br.readLine()) != null) {
+			String procline = "";
+			
+			//Step 1: Remove meaningless symbols including "=T", "<>", and count number in the begging etc
+			//String pat = "=T|\\<?[a-z]+:|\\>|:|=|\\(|\\)|\\s*\\d+\\. +";
+			String pat = "=1|\\<?[a-z]+:|\\>|:|=|\\(|\\)|\\s*\\d+\\. +";
+			Pattern p = Pattern.compile(pat);
+			Matcher m = p.matcher(line);
+			line = m.replaceAll("");
+			
+			//Step 2: Distinguish spaces inside features from outside by replace spaces inside with "_"   
+//			String pat0 = "(\\[([A-Z\\-\\d]+ +)+[A-Z\\-\\d]+\\])|(\\[([A-Z \\-\\d]+, )+([A-Z \\-\\d])+\\])";
+			String pat0 = "(\\[\\s+\\w+\\]|\\[([\\w\\-\\s/]+\\s+)+[\\w\\-/]+\\])|(\\[([\\w\\s\\-/]+,\\s)+([\\w\\s\\-/])+\\])";
+			Pattern p0 = Pattern.compile(pat0);
+			Matcher m0 = p0.matcher(line);
+			StringBuffer sb = new StringBuffer();
+//			System.out.println(m0.find());
+			while (m0.find()) {
+				String replace = line.substring(m0.start(), m0.end()).replace(" ", "_");
+//				System.out.println(replace);
+				m0.appendReplacement(sb, replace);
+			}
+			m0.appendTail(sb);
+			line = sb.toString();
+			
+			//Step 3: Replace spaces outside of features with "|"
+			String delim = " +";
+			String[] parts = line.split(delim);
+			for (int i=0; i < parts.length; i++) {
+				procline = String.join("|", procline, parts[i]);
+			}
+			procline = procline.replaceFirst("\\|", "");
+			
+			//Step 4: Change back spaces inside of features
+			String pat4 = "_";
+			Pattern p4 = Pattern.compile(pat4);
+			Matcher m4 = p4.matcher(procline);
+			procline = m4.replaceAll(" ");
+			System.out.println(procline);
+			
+			bw.write(procline + "\n"); // Write to file
+					
+		}
+		br.close();
+		bw.close();
+
+	}
+
+}