Example 1: Implementation of Java Regular Expressions
KW.java
importjava.util.*;importjava.util.regex.*;classKW{publicstaticvoidmain(Stringargs[]){Strings;Scannersc=newScanner(System.in);System.out.println("____________________________________");System.out.println("Implementation of Regular Expression");System.out.println("____________________________________");System.out.print("Enter a number ");s=sc.nextLine();if(Pattern.matches("\\d*",s)){System.out.println("\nNumber accepted");}else{System.out.println("\nError: number unacceptable");}System.out.println("____________________________________");}}
Output
kodingwindow@kw:~$ javac KW.java kodingwindow@kw:~$ java KW
____________________________________
Implementation of Regular Expression
____________________________________
Enter a number KW
Error: number unacceptable
____________________________________
kodingwindow@kw:~$ java KW
____________________________________
Implementation of Regular Expression
____________________________________
Enter a number 12
Number accepted
____________________________________
kodingwindow@kw:~$
Example 2: Implementation of Java Regular Expressions
KW.java
importjava.util.*;importjava.util.regex.*;classKW{publicstaticvoidmain(Stringargs[]){Strings;Scannersc=newScanner(System.in);System.out.println("____________________________________");System.out.println("Implementation of Regular Expression");System.out.println("____________________________________");System.out.print("Enter your 6-digit PIN code ");s=sc.nextLine();if(Pattern.matches("\\d{6}",s)){System.out.println("\nCongratulations! your PIN code accepted successfully.");}else{System.out.println("\nPlease enter digits only");}System.out.println("____________________________________");}}
Output
kodingwindow@kw:~$ javac KW.java kodingwindow@kw:~$ java KW
____________________________________
Implementation of Regular Expression
____________________________________
Enter your 6-digit PIN code -23566
Please enter digits only
____________________________________
kodingwindow@kw:~$ java KW
____________________________________
Implementation of Regular Expression
____________________________________
Enter your 6-digit PIN code 400099
Congratulations! your PIN code accepted successfully.
____________________________________
kodingwindow@kw:~$
Dear User, Thank you for visitng Kodingwindow. If you are interested in technical articles, latest technologies, and our journey further, please follow us on LinkedIn.
Dear User, We are grateful for your interest in the Kodingwindow Android app. We intend to soon make it available on the Google Play Store. Currently, Android versions 10 and up require manual apk installations. Would you like to get the app?