This Example describe the way to replace a 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 i nput 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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