Source Code : Adding Comments to a Regular Expression

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Adding Comments to a Regular Expression

 

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

public class Main {
  public static void main(String[] argv) throws Exception {
    // Use COMMENTS but include a character class with a space

    CharSequence inputStr = "a b";
    String patternStr = "a b";

    // Compile without comments
    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher = pattern.matcher(inputStr);
    boolean matchFound = matcher.matches(); 

    // Compile with comments
    pattern = Pattern.compile(patternStr, Pattern.COMMENTS);
    matcher = pattern.matcher(inputStr);
    matchFound = matcher.matches(); 

    patternStr = "a  [\ ]  b";
    pattern = Pattern.compile(patternStr, Pattern.COMMENTS);
    matcher = pattern.matcher(inputStr);
    matchFound = matcher.matches(); 
  }
}

   
  

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