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import java.util.regex.*;
public class RegexExample1{
public static void main(String args[]){
//1st way
Pattern p = Pattern.compile(".s");//. represents single character
Matcher m = p.matcher("as");
boolean b = m.matches();

//2nd way
boolean b2=Pattern.compile(".s").matcher("as").matches();

//3rd way
boolean b3 = Pattern.matches(".s", "as");

System.out.println(b+" "+b2+" "+b3);
}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample1 target=_blank> Test it Now </a> </span> <h4 class=h4>Output</h4> <div class=codeblock3><pre>true true true
</pre></div> <hr> <h2 class=h2>Regular Expression . Example</h2> <p>The . (dot) represents a single character.</p> <div class=codeblock><textarea class=java name=code>
import java.util.regex.*;
class RegexExample2{
public static void main(String args[]){
System.out.println(Pattern.matches(".s", "as"));//true (2nd char is s)
System.out.println(Pattern.matches(".s", "mk"));//false (2nd char is not s)
System.out.println(Pattern.matches(".s", "mst"));//false (has more than 2 char)
System.out.println(Pattern.matches(".s", "amms"));//false (has more than 2 char)
System.out.println(Pattern.matches("..s", "mas"));//true (3rd char is s)
}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample2 target=_blank> Test it Now </a> </span> <hr> <h2 class=h2>Regex Character classes</h2> <table class=alt><tbody><tr><th>No.<th>Character Class<th>Description<tr><td>1<td>[abc]<td>a, b, or c (simple class)<tr><td>2<td>[^abc]<td>Any character except a, b, or c (negation)<tr><td>3<td>[a-zA-Z]<td>a through z or A through Z, inclusive (range)<tr><td>4<td>[a-d[m-p]]<td>a through d, or m through p: [a-dm-p] (union)<tr><td>5<td>[a-z&&[def]]<td>d, e, or f (intersection)<tr><td>6<td>[a-z&&[^bc]]<td>a through z, except for b and c: [ad-z] (subtraction)<tr><td>7<td>[a-z&&[^m-p]]<td>a through z, and not m through p: [a-lq-z](subtraction)</table> <hr> <h2 class=h2>Regular Expression Character classes Example</h2> <div class=codeblock><textarea class=java name=code>
import java.util.regex.*;
class RegexExample3{
public static void main(String args[]){
System.out.println(Pattern.matches("[amn]", "abcd"));//false (not a or m or n)
System.out.println(Pattern.matches("[amn]", "a"));//true (among a or m or n)
System.out.println(Pattern.matches("[amn]", "ammmna"));//false (m and a comes more than once)
}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample3 target=_blank> Test it Now </a> </span> <hr> <h2 class=h2>Regex Quantifiers</h2> <p>The quantifiers specify the number of occurrences of a character.</p> <table class=alt><tbody><tr><th>Regex<th>Description<tr><td>X?<td>X occurs once or not at all<tr><td>X+<td>X occurs once or more times<tr><td>X*<td>X occurs zero or more times<tr><td>X{n}<td>X occurs n times only<tr><td>X{n,}<td>X occurs n or more times<tr><td>X{y,z}<td>X occurs at least y times but less than z times</table> <hr> <h2 class=h2>Regular Expression Character classes and Quantifiers Example</h2> <div class=codeblock><textarea class=java name=code>
import java.util.regex.*;
class RegexExample4{
public static void main(String args[]){
System.out.println("? quantifier ....");
System.out.println(Pattern.matches("[amn]?", "a"));//true (a or m or n comes one time)
System.out.println(Pattern.matches("[amn]?", "aaa"));//false (a comes more than one time)
System.out.println(Pattern.matches("[amn]?", "aammmnn"));//false (a m and n comes more than one time)
System.out.println(Pattern.matches("[amn]?", "aazzta"));//false (a comes more than one time)
System.out.println(Pattern.matches("[amn]?", "am"));//false (a or m or n must come one time)

System.out.println("+ quantifier ....");
System.out.println(Pattern.matches("[amn]+", "a"));//true (a or m or n once or more times)
System.out.println(Pattern.matches("[amn]+", "aaa"));//true (a comes more than one time)
System.out.println(Pattern.matches("[amn]+", "aammmnn"));//true (a or m or n comes more than once)
System.out.println(Pattern.matches("[amn]+", "aazzta"));//false (z and t are not matching pattern)

System.out.println("* quantifier ....");
System.out.println(Pattern.matches("[amn]*", "ammmna"));//true (a or m or n may come zero or more times)

}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample4 target=_blank> Test it Now </a> </span> <hr> <h2 class=h2>Regex Metacharacters</h2> <p>The regular expression metacharacters work as shortcodes.</p> <table class=alt><tbody><tr><th>Regex<th>Description<tr><td>.<td>Any character (may or may not match terminator)<tr><td>\d<td>Any digits, short of [0-9]<tr><td>\D<td>Any non-digit, short for [^0-9]<tr><td>\s<td>Any whitespace character, short for [\t\n\x0B\f\r]<tr><td>\S<td>Any non-whitespace character, short for [^\s]<tr><td>\w<td>Any word character, short for [a-zA-Z_0-9]<tr><td>\W<td>Any non-word character, short for [^\w]<tr><td>\b<td>A word boundary<tr><td>\B<td>A non word boundary</table> <hr> <h2 class=h2>Regular Expression Metacharacters Example</h2> <div class=codeblock><textarea class=java name=code>
import java.util.regex.*;
class RegexExample5{
public static void main(String args[]){
System.out.println("metacharacters d....");\\d means digit

System.out.println(Pattern.matches("\\d", "abc"));//false (non-digit)
System.out.println(Pattern.matches("\\d", "1"));//true (digit and comes once)
System.out.println(Pattern.matches("\\d", "4443"));//false (digit but comes more than once)
System.out.println(Pattern.matches("\\d", "323abc"));//false (digit and char)

System.out.println("metacharacters D....");\\D means non-digit

System.out.println(Pattern.matches("\\D", "abc"));//false (non-digit but comes more than once)
System.out.println(Pattern.matches("\\D", "1"));//false (digit)
System.out.println(Pattern.matches("\\D", "4443"));//false (digit)
System.out.println(Pattern.matches("\\D", "323abc"));//false (digit and char)
System.out.println(Pattern.matches("\\D", "m"));//true (non-digit and comes once)

System.out.println("metacharacters D with quantifier....");
System.out.println(Pattern.matches("\\D*", "mak"));//true (non-digit and may come 0 or more times)

}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample5 target=_blank> Test it Now </a> </span> <hr> <h2 class=h2>Regular Expression Question 1</h2> <div class=codeblock><textarea class=java name=code>
/*Create a regular expression that accepts alphanumeric characters only. 
Its length must be six characters long only.*/

import java.util.regex.*;
class RegexExample6{
public static void main(String args[]){
System.out.println(Pattern.matches("[a-zA-Z0-9]{6}", "arun32"));//true
System.out.println(Pattern.matches("[a-zA-Z0-9]{6}", "kkvarun32"));//false (more than 6 char)
System.out.println(Pattern.matches("[a-zA-Z0-9]{6}", "JA2Uk2"));//true
System.out.println(Pattern.matches("[a-zA-Z0-9]{6}", "arun$2"));//false ($ is not matched)
}}
</textarea></div> <hr> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample6 target=_blank> Test it Now </a> </span> <h2 class=h2>Regular Expression Question 2</h2> <div class=codeblock><textarea class=java name=code>
/*Create a regular expression that accepts 10 digit numeric characters
 starting with 7, 8 or 9 only.*/

import java.util.regex.*;
class RegexExample7{
public static void main(String args[]){
System.out.println("by character classes and quantifiers ...");
System.out.println(Pattern.matches("[789]{1}[0-9]{9}", "9953038949"));//true
System.out.println(Pattern.matches("[789][0-9]{9}", "9953038949"));//true

System.out.println(Pattern.matches("[789][0-9]{9}", "99530389490"));//false (11 characters)
System.out.println(Pattern.matches("[789][0-9]{9}", "6953038949"));//false (starts from 6)
System.out.println(Pattern.matches("[789][0-9]{9}", "8853038949"));//true

System.out.println("by metacharacters ...");
System.out.println(Pattern.matches("[789]{1}\\d{9}", "8853038949"));//true
System.out.println(Pattern.matches("[789]{1}\\d{9}", "3853038949"));//false (starts from 3)

}}
</textarea></div> <span class=testit> <a href=https://www.javatpoint.com/opr/test.jsp?filename=RegexExample7 target=_blank> Test it Now </a> </span> <h2 class=h2>Java Regex Finder Example</h2> <div class=codeblock><textarea class=java name=code>
import java.util.regex.Pattern;
import java.util.Scanner;
import java.util.regex.Matcher;  
public class RegexExample8{  
    public static void main(String[] args){  
        Scanner sc=new Scanner(System.in);
        while (true) {  
        	System.out.println("Enter regex pattern:");
            Pattern pattern = Pattern.compile(sc.nextLine());  
            System.out.println("Enter text:");
            Matcher matcher = pattern.matcher(sc.nextLine());  
            boolean found = false;  
            while (matcher.find()) {  
                System.out.println("I found the text "+matcher.group()+" starting at index "+  
                 matcher.start()+" and ending at index "+matcher.end());  
                found = true;  
            }  
            if(!found){  
                System.out.println("No match found.");  
            }  
        }  
    }  
}  
</textarea></div> <p>Output:</p> <div class=codeblock3><pre>Enter regex pattern: java
Enter text: this is java, do you know java
I found the text java starting at index 8 and ending at index 12
I found the text java starting at index 26 and ending at index 30
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