Replacing String using Regularexpression

Replacing String using Regularexpression

This Example describe the way to replace a String using Regularexpression. The steps involved in replacing a String are described below:

import java.util.regex.Matcher:-Matcher is a class that performs operation character sequence by using pattern.

import java.util.regex.Pattern:-Pattern is a class which is the compiled representation of a regularexpression.

String reg = "[0-9b-c]":-Regular expression for excluding digit from 1 to 9 , and letters from b to c.

Pattern pattern = Pattern.compile(reg):-Creates a pattern object and compiles the given regular expression into a pattern.

Matcher matcher = pattern.matcher(text):-Creates a matcher that will match the given input against this pattern.

matcher.appendReplacement(buffer,replacingtext):- This method is a non-terminal append-and-replace step.

matcher.appendTail(buffer):-This method is a terminal append-and-replace step.

RegularExpressionReplace.java

import java.util.regex.Matcher;

import java.util.regex.Pattern;



public class RegularExpressionReplace {

  public static void main(String[] args) {

  String reg = 
color="#2a00ff">"[0-9b-c]";

  String text = "bcbcbcbbbbRbbboccbcbscbbbeibbndccibba" +

  ".nbbebbtbbpbbvbbtbb.bbtccdcc" +

   " 1232 4 4545454 4545 454 5465 4";

  String replacingtext = "";

  System.out.println("Text before replacing is:-"+"\n"+text);

  Pattern pattern = Pattern.compile(reg);

  Matcher matcher = pattern.matcher(text);

  StringBuffer buffer = new StringBuffer();

  while (matcher.find()) {

  matcher.appendReplacement(buffer,replacingtext);

  }

  matcher.appendTail(buffer);

  System.out.println("====================================");

  System.out.print("Text after replacing is:-");

  System.out.println(buffer.toString());

  }

}

output of the program:-

Text before replacing is:-
bcbcbcbbbbRbbboccbcbscbbbeibbndccibba.nbbebbtbb
pbbvbbtbb.bbtccdcc 1232 4 4545454 4545 454 5465 4
====================================
Text after replacing is:-Roseindia.netpvt.td

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Replacing String using Regularexpression

Replacing String using Regularexpression

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