This Example describe the way to print the matching word from the file using Regularexpression.

Print Matchingwords using Regular expression

     

This Example describe the way to print the matching word from the file using Regularexpression. The steps involved in matching are described below:-

Step1:- Create a text file and writes some text to it.The text file I have created here is:-

 

 

 

 

D.txt

Angeles Angeles Angeles Angeles Angeles Angeles Angele  Angele  Angele  Angele  Angele  Angele Angele  Angele  Angele  Angel  Angel Angel Angel Angel  Angel  Angel  Angel  Angel  Angel  Angel Ange Ange Ange&nbs p;Ange Ange Ange Ange Ange Ange Ange dcjk 4645423 24221 224121 5245241 55241 542541 441 5541 41441

Pattern pattern = Pattern.compile("[0-9]+"):-This method compiles the given regular expression into a pattern.[0-9] is the range to be compiled.In other words means include all the digit form range 1 to 9.

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

Print_matching_word.java

import java.util.regex.*; import java.io.*; public class Print_matching_word {   public static void main(String[] args) throws Exception {   Pattern pattern = Pattern.compile("[0-9]+");   BufferedReader br = new BufferedReader   (new FileReader("/home/girish/Desktop/D.txt"));   String text;         System.out.println("Words with digit 1 to 9 are:");   while ((text = br.readLine()) != null) {   Matcher matcher =pattern.matcher(text);   while (matcher.find()) {   int start = matcher.start(0);   System.out.println(text.substring(start));   }   }   } }

Output of the program:-

Words with digit 1 to 9 are: 4645423 24221 224121 5245241 55241 542541 441 5541 41441

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