Regex

Author: sb255

Readme.md

@@ -109,15 +109,13 @@ public class Test extends PreTest {
 
 }
 
-/*---- NOTE: Always pay attention to new Test() or the new Class(), it will tell you which class
-that object is going to create an image of, then no matter which class' object reference it has,
-it is only going to have methods of the class mentioned with new keyword ----*/
-
-
-/*-- PreTest obj = new Test(); (Then blue print of Test Class will be created) --*/
 
 ```
 
+> NOTE: (Require correction) Always pay attention to new Test() or the new Class(), it will tell you which class
+that object is going to create an image of, then no matter which class' object reference it has,
+it is only going to have methods of the class mentioned with new keyword.
+
 ## *Comparators in Java:*
 
 ```java
@@ -287,3 +285,22 @@ public class Test{
 
 }
 ```
+
+## *Regular Expressions in Java:*
+
+
+| SN | Regular Expression | Description
+| :----: | :---: | :---:
+| 1 | `[A-Za-z]` | It matches all the uppercase and lowercase characters
+| 2 | `[-+.^:,]` | It matches all the special characters
+| 3 | `[.]` | It matches with a character of any kind
+
+
+## *Lambdas in Java programming:*
+
+*Printing with characters with the help of Java Stream:*
+
+```java
+int[] arr = {1,2,3,4,5,6,7,8,9};
+Arrays.stream(arr).map(i->i*i).forEach(System.out::println);
+```

Topics/JavaRegex2.java

@@ -3,8 +3,8 @@
 import java.util.regex.Pattern;
 
 
-/*  Problem statement: 
- *  Validating a phone number BAA-AAA-AAAA using regular expression in Java.. 
+/*  Problem statement:
+ *  Validating a phone number BAA-AAA-AAAA using regular expression in Java..
  *  ..where A is a digit ranging 0-9 and B is also a digit ranging 1-9
  */
 
@@ -14,30 +14,27 @@
  *     \\w   - Any alphanumeric character
  *     \\.   - Dot character
  *     +     - More than one character
- *     [1-9] - Any digit between 1 to 9  
+ *     [1-9] - Any digit between 1 to 9
  */
 
 public class JavaRegex2 {
 
     public static void main(String[] args) {
-        
-        Scanner sc = new Scanner(System.in); 
+
+        Scanner sc = new Scanner(System.in);
         String email = sc.next();
-        
-        Pattern p = Pattern.compile("^[1-9]\\d{2}-\\d{3}-\\d{4}$"); 
+
+        Pattern p = Pattern.compile("^[1-9]\\d{2}-\\d{3}-\\d{4}$");
 
         Matcher matcher = p.matcher(email);
-    
+
         if(matcher.find()){
             System.out.println("This is a valid phone number");
         }
-        
+
         else
             System.out.println("This is not a valid phone number");
 
     }
 
 }
-
-
-