JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to match a format in string using regular expression?


Description:

Below example shows how to match a string pattern with a regular expression. String.matches() method helps to match the string with a regex. Below example checkes weather given string starts with "www" or not.


Code:
package com.myjava.string;

public class MyStrMatches {

    public static void main(String a[]){
    
        String[] str = {"www.java2novice.com", "http://java2novice.com"};
        for(int i=0;i < str.length;i++){
            if(str[i].matches("^www\\.(.+)")){
                System.out.println(str[i]+" Starts with 'www'");
            } else {
                System.out.println(str[i]+" is not starts with 'www'");
            }
        }
    }
}

Example Output

www.java2novice.com Starts with 'www'
http://java2novice.com is not starts with 'www'

Other String Function Examples

Knowledge Centre
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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