regular expression java

java regex matcher example

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class MatcherExample {

    public static void main(String[] args) {

        String text    =
            "This is the text to be searched " +
            "for occurrences of the http:// pattern.";

        String patternString = ".*http://.*";

        Pattern pattern = Pattern.compile(patternString);

        Matcher matcher = pattern.matcher(text);
        boolean matches = matcher.matches();
      
      	int count = 0;
        while(matcher.find()) {
            count++;
            System.out.println("found: " + count + " : "
                    + matcher.start() + " - " + matcher.end());
        }
    }
}

Posted by: Guest on December-21-2020

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); }}

//Ther are three type of REGULAR EXPRESSION //first ^(.+)@(.+)$ "^(.+)@(.+)$\"" //second ^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$ //third ^[\\w!#$%&'*+/=?`{|}~^-]+(?:\\.[\\w!#$%&'*+/=?`{|}~^-]+)*@(?!-)(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$

import java.io.*; import java.util.regex.*; public class testRegex { private static Pattern pattern; private static Matcher matcher; public static void main(String args[]) { pattern = Pattern.compile("Hugo"); matcher = pattern.matcher("Hugo Etiévant"); while(matcher.find()) { System.out.println("Trouvé !"); } } }

public class TestLambda { public static void main(String args[]) { List<String> lowerCaseStringsList = Arrays.asList("a","b","c"); // the :: notation is the lambda expression // it's the same as the anonymous function s -> s.toUpperCase() List<String> upperCaseStringsList = lowerCaseStringsList.stream(). map(String::toUpperCase). collect(Collectors.toList()); } }

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