/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
final String regex
= "^(#{1,6}\\s*[\\S]+)"; final String string
= "#heading 1 \n" + "bla bla bla\n"
+ "### heading 3 djdjdj\n"
+ "bla bla bla\n"
+ "## heading 2 bal;kasddfas\n"
+ "fbla bla bla";
final String subst
= "<b>$1</b>";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
// The substituted value will be contained in the result variable
final String result
= matcher.
replaceAll(subst
);
System.
out.
println("Substitution result: " + result
); }
}
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