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Program: How to replace a pattern using regular expression in java?


Description:

Below example gives sample code for replacing given regular expression pattern with a text.


Code:
package com.java2novice.regex;

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

public class MyPatternReplace {

	public String replaceWithPattern(String str,String replace){
		
		Pattern ptn = Pattern.compile("\\s+");
		Matcher mtch = ptn.matcher(str);
		return mtch.replaceAll(replace);
	}
	
	public static void main(String a[]){
		String str = "My    name	is  kingkon.  ";
		MyPatternReplace mpr = new MyPatternReplace();
		System.out.println(mpr.replaceWithPattern(str, " "));
	}
}

Output:
My name is kingkon. 
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Knowledge Centre
Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces useful we must create subclasses. The final keyword makes a class unable to be extended.
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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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