Use an inline modifier: a (?x: b)

 


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

public class Main {
  public static void main(String[] argv) throws Exception {

    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(); // false

    // Use an inline modifier

    matchFound = pattern.matches("a (?x:  b   )", inputStr); 
  }
}

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Use an inline modifier: a (?x: b) : Pattern « Regular Expressions « Java

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