How to use Java Regular Expression

Published in Java
May 15, 2023
1 min read

Regular expression is used to find a string part that matches the desired condition(pattern) in the string data, and refers to a string created using predefined symbols and characters.

🌱Java Sample

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] args) {
// String to compare
String txt = "number1487context";
// Regular Expression Grammar in String Form
String patternString = "^[0-9]+";
// 1) Converting regular expression grammar in the form of a string into regular expression patterns
Pattern pattern = Pattern.compile(patternString);
// 2) Examine the string with the matcher method as a pattern object and return filtered results to the matcher object
Matcher matcher = pattern.matcher(txt);
// 3) Matcher containing filtered regular expressions outputs results via method
System.out.println(matcher.find()); // Do you have a matching result? : true
System.out.println(matcher.group()); // Returns the matched part : 1487
// How to handle multiple matched results
while (matcher.find()) {




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