import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "\\[url\n"
+ "(?|\n"
+ " ] ((https?://[^[]+))\n"
+ " |\n"
+ " (?:=\"(https?://[^\"]+)\")] (.+?)\n"
+ ")\n"
+ "\\[/url]";
final String string = "[URL]www.no.http.example.com[/URL]\n"
+ "[url]https://any.com/any[/url]\n"
+ "[url=\"nourl\"]nourl[/url]\n"
+ "[URL=\"https://any.com/any?any=333\"]text text[/URL]\n"
+ "[url=\"http://www.emptyTEXT.com\"][/url]\n"
+ "[url]http://www.any.com/any?any=44#sss[/url]";
final String subst = "<a href=\"$1\">$2</a>";
final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.COMMENTS);
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);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html