diff --git a/src/lsystem/Main.java b/src/lsystem/Main.java
index fe0083a..dcba497 100644
--- a/src/lsystem/Main.java
+++ b/src/lsystem/Main.java
@@ -1,7 +1,6 @@
 package lsystem;
 
 import lsystem.engine.parser.Parser;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
@@ -11,6 +10,7 @@ public class Main {
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
         Parser parser = null;
+        int nbIterations = 0;
         while(parser == null || parser.isCorrect()) {
             if(parser != null)
                 System.out.println("Vos règles ou votre axiome ne sont pas correctement écrites, veuillez recommencer");
@@ -22,7 +22,7 @@ public class Main {
                 rules.add(scanner.next());
             }
             rules.remove(rules.size() - 1);
-            parser = new Parser(axiom, rules);
+            parser = new Parser(axiom, rules,nbIterations);
         }
 
         scanner.close();
diff --git a/src/lsystem/engine/parser/Parser.java b/src/lsystem/engine/parser/Parser.java
index b7b4401..febec65 100644
--- a/src/lsystem/engine/parser/Parser.java
+++ b/src/lsystem/engine/parser/Parser.java
@@ -6,15 +6,50 @@ public class Parser {
 
     private final String axiom;
     private final List<String> rules;
+    private final int nbIterations;
+    private String[] validStrings = {"]","[",".","+","-","X","Y","Z","x","y","z","0","1","2","3","4","5","6","7","8","9"};
 
-    public Parser(String axiom, List<String> rules) {
+    public Parser(String axiom, List<String> rules,int nbIterations) {
         this.axiom = axiom;
         this.rules = rules;
+        this.nbIterations = nbIterations;
     }
 
     public boolean isCorrect(){
-
-        return false;
+    	return (rulesCorrect() || axiomCorrect());
     }
+    private boolean axiomCorrect() {
+		
+		return false;
+	}
 
+	public boolean rulesCorrect() {
+    	for(String r : this.rules) {
+    		String[] stringsplitted = r.split("");
+	        String old = null;
+	        int bracket = 0;
+	        for (String rules : stringsplitted){
+	            for(String string : validStrings){
+	            	if (rules == "[")
+	            		bracket += 1;
+	            	if(rules =="]")
+	            		bracket -=1;
+	                if(old == "."){
+	                    for(int i = 0;i<10;i++){
+	                        if(rules == validStrings[i])
+	                            return false;
+	                    }
+	                }
+	                old = rules;
+	                if(rules == string)
+	                    break;
+	                if(string == "9" && rules != string)
+	                    return false;
+	            }
+	        }
+	    	if (bracket != 0)
+	    		return false;
+    	}
+        return true;
+    }
 }