Java Pattern pattern() Method Last Updated : 10 Jan, 2025 Comments Improve Suggest changes Like Article Like Report pattern() method of the Pattern class in Java is used to get the regular expression which is compiled to create this pattern. We use a regular expression to create the pattern and this method is used to get the same source expression. Example 1: Using the pattern() method to check the regex pattern passed for pattern matching. Java // Java program to demonstrate // Pattern.pattern() method import java.util.regex.*; public class Geeks { public static void main(String[] args) { // create a REGEX String String REGEX = "(.*)(for)(.*)?"; // create the string in which you want // to search String actualString = "code of Machine"; // create pattern Pattern pattern1 = Pattern.compile(REGEX); // find the regular expression of pattern String RegularExpression = pattern1.pattern(); System.out.println("Pattern's RegularExpression = " + RegularExpression); } } OutputPattern's RegularExpression = (.*)(for)(.*)? Syntaxpublic String pattern()Parameters: This method does not accepts anything as parameter. Return Value: This method returns the pattern's source regular expression. Example 2: Using the pattern() method in conjunction with a Matcher. Java // Java program to demonstrate the usage of // regular expressions in pattern matching import java.util.regex.Matcher; import java.util.regex.Pattern; public class Geeks { public static void main(String[] args) { // Input strings to match the regex against String input1 = "The quick brown fox jumps over the lazy dog"; String input2 = "The quick red fox jumps over the lazy dog"; // Regex pattern to match case-insensitive 'the' String regex = "(?i)the"; // Compile the regex pattern Pattern pattern = Pattern.compile(regex); // Create matchers for both input strings Matcher matcher1 = pattern.matcher(input1); Matcher matcher2 = pattern.matcher(input2); // Find and print all matches in input1 while (matcher1.find()) { System.out.println("Match 1: " + matcher1.group()); } // Find and print all matches in input2 while (matcher2.find()) { System.out.println("Match 2: " + matcher2.group()); } } } OutputMatch 1: The Match 1: the Match 2: The Match 2: the Comment More infoAdvertise with us Next Article Java Pattern pattern() Method A AmanSingh2210 Follow Improve Article Tags : Java Java-Functions Java 8 Java-Pattern Practice Tags : Java Similar Reads Java Matcher pattern() Method The pattern() method of the Matcher class is used to get the pattern to be matched by this matcher.Example 1: The below example demonstrates how the pattern() method retrieves the regex pattern "G.*s$" used to match a string ending with "s" and starting with "G".Java// Java code to illustrate patter 2 min read Pattern toString() Method in Java with Examples toString() method of a Pattern class used to return the string representation of this pattern. This return the regular expression from which this pattern was compiled. Syntax: public String toString() Parameters: This method accepts nothing as parameter. Return value: This method returns a string re 1 min read Matcher usePattern(Pattern) method in Java with Examples The usePattern() method of Matcher Class is used to get the pattern to be matched by this matcher. Syntax: public Matcher usePattern(Pattern newPattern) Parameters: This method takes a parameter newPattern which is the new pattern to be set. Return Value: This method returns a Matcher with the new P 2 min read Pattern quote(String) method in Java with Examples quote(String) method of a Pattern class used to returns a literal pattern String for the specified String passed as parameter to method.This method produces a String equivalent to s that can be used to create a Pattern. Metacharacters or escape sequences in the input sequence will be given no specia 3 min read Pattern splitAsStream() Method in Java with Examples splitAsStream() method of a Pattern class used to return a stream of String from the given input sequence passed as parameter around matches of this pattern.this method is the same as the method split except that what we get back is not an array of String objects but a stream. If this pattern does n 2 min read Like