RegEx

var sentence = 'The internet browser Mozilla Firefox awesome.';
var match = sentence.match(/(Firefox)/)[0];
document.write(match); // Firefox

Pattern pattern = Pattern.compile("(Firefox)");
Matcher matcher = pattern.matcher("The internet browser Mozilla Firefox awesome.");
matcher.find();
System.out.println(matcher.group(0)); // Firefox

var sentence = 'I like the Mozilla Firefox browser.';
var match = sentence.match(/.*(Mozilla).*(Firefox).*/)[0];
document.write(match); // I like the Mozilla Firefox browser.

Pattern pattern = Pattern.compile(".*(Mozilla).*(Firefox).*");
Matcher matcher = pattern.matcher("I like the Mozilla Firefox browser.");
matcher.find();
System.out.println(matcher.group(0)); // I like the Mozilla Firefox browser.

var sentence = 'Match everything, after the first comma.';
var match = sentence.match(/,.*$/)[0];
document.write(match); // , after the first comma.

Pattern pattern = Pattern.compile(",.*$");
Matcher matcher = pattern.matcher("Match everything, after the first comma.");
matcher.find();
System.out.println(matcher.group(0)); // , after the first comma.

var sentence = 'Match everything, after the last comma, hihi.';
var match = sentence.match(/[^,]*$/)[0];
document.write(match); // hihi.

Pattern pattern = Pattern.compile("[^,]*$");
Matcher matcher = pattern.matcher("Match everything, after the last comma, hihi.");
matcher.find();
System.out.println(matcher.group(0)); //  hihi

var sentence = 'I like pizza too much.';
var match = sentence.match(/^((?!pizza).)*$/);
document.write(match); // null

Pattern pattern = Pattern.compile("^((?!pizza).)*$");
Matcher matcher = pattern.matcher("I like pizza too much.");
matcher.find();
System.out.println(matcher.group(0)); // java.lang.IllegalStateException: No match found

var url = 'www.bennyn.de';
var match = url.match(/[^www.].*/)[0];
document.write(match); // bennyn.de

Pattern pattern = Pattern.compile("[^www.].*");
Matcher matcher = pattern.matcher("www.bennyn.de");
matcher.find();
System.out.println(matcher.group(0)); // bennyn.de

var sentence = 'The dot is missing.';
var match = sentence.match(/.*?(?=\.)/)[0];
document.write(match); // The dot is missing

Pattern pattern = Pattern.compile(".*?(?=\\.)");
Matcher matcher = pattern.matcher("The dot is missing.");
matcher.find();
System.out.println(matcher.group(0)); // The dot is missing

var url = 'http://angelcode.de:3000/room/e0e669ac5fe7ca5';
var match = url.match(/[^http:\/\/].*?(?=:)/)[0];
document.write(match); // angelcode.de

Pattern pattern = Pattern.compile("[^http:\\/\\/].*?(?=:)");
Matcher matcher = pattern.matcher("http://angelcode.de:3000/room/e0e669ac5fe7ca5");
matcher.find();
System.out.println(matcher.group(0)); // angelcode.de