v8/test/mjsunit/regexp-global.js

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// Test that an optional capture is cleared between two matches.
var str = "ABX X";
str = str.replace(/(\w)?X/g, function(match, capture) {
                               assertTrue(match.indexOf(capture) >= 0 ||
                                           capture === undefined);
                               return capture ? capture.toLowerCase() : "-";
                             });
assertEquals("Ab -", str);

// Test zero-length matches.
str = "Als Gregor Samsa eines Morgens";
str = str.replace(/\b/g, function(match, capture) {
                           return "/";
                         });
assertEquals("/Als/ /Gregor/ /Samsa/ /eines/ /Morgens/", str);

// Test zero-length matches that have non-zero-length sub-captures.
str = "It was a pleasure to burn.";
str = str.replace(/(?=(\w+))\b/g, function(match, capture) {
                                    return capture.length;
                                  });
assertEquals("2It 3was 1a 8pleasure 2to 4burn.", str);

// Test multiple captures.
str = "Try not. Do, or do not. There is no try.";
str = str.replace(/(not?)|(do)|(try)/gi,
                  function(match, c1, c2, c3) {
                    assertTrue((c1 === undefined && c2 === undefined) ||
                               (c2 === undefined && c3 === undefined) ||
                               (c1 === undefined && c3 === undefined));
                    if (c1) return "-";
                    if (c2) return "+";
                    if (c3) return "="
                  });
assertEquals("= -. +, or + -. There is - =.", str);

// Test multiple alternate captures.
str = "FOUR LEGS GOOD, TWO LEGS BAD!";
str = str.replace(/(FOUR|TWO) LEGS (GOOD|BAD)/g,
                  function(match, num_legs, likeability) {
                    assertTrue(num_legs !== undefined);
                    assertTrue(likeability !== undefined);
                    if (num_legs == "FOUR") assertTrue(likeability == "GOOD");
                    if (num_legs == "TWO") assertTrue(likeability == "BAD");
                    return match.length - 10;
                  });
assertEquals("4, 2!", str);


// The same tests with UC16.

//Test that an optional capture is cleared between two matches.
str = "AB\u1234 \u1234";
str = str.replace(/(\w)?\u1234/g,
                  function(match, capture) {
                    assertTrue(match.indexOf(capture) >= 0 ||
                               capture === undefined);
                    return capture ? capture.toLowerCase() : "-";
                  });
assertEquals("Ab -", str);

// Test zero-length matches.
str = "Als \u2623\u2642 eines Morgens";
str = str.replace(/\b/g, function(match, capture) {
                           return "/";
                         });
assertEquals("/Als/ \u2623\u2642 /eines/ /Morgens/", str);

// Test zero-length matches that have non-zero-length sub-captures.
str = "It was a pleasure to \u70e7.";
str = str.replace(/(?=(\w+))\b/g, function(match, capture) {
                                    return capture.length;
                                  });
assertEquals("2It 3was 1a 8pleasure 2to \u70e7.", str);

// Test multiple captures.
str = "Try not. D\u26aa, or d\u26aa not. There is no try.";
str = str.replace(/(not?)|(d\u26aa)|(try)/gi,
                  function(match, c1, c2, c3) {
                    assertTrue((c1 === undefined && c2 === undefined) ||
                               (c2 === undefined && c3 === undefined) ||
                               (c1 === undefined && c3 === undefined));
                    if (c1) return "-";
                    if (c2) return "+";
                    if (c3) return "="
                  });
assertEquals("= -. +, or + -. There is - =.", str);

// Test multiple alternate captures.
str = "FOUR \u817f GOOD, TWO \u817f BAD!";
str = str.replace(/(FOUR|TWO) \u817f (GOOD|BAD)/g,
                  function(match, num_legs, likeability) {
                    assertTrue(num_legs !== undefined);
                    assertTrue(likeability !== undefined);
                    if (num_legs == "FOUR") assertTrue(likeability == "GOOD");
                    if (num_legs == "TWO") assertTrue(likeability == "BAD");
                    return match.length - 7;
                  });
assertEquals("4, 2!", str);

// Test capture that is a real substring.
var str = "Beasts of England, beasts of Ireland";
str = str.replace(/(.*)/g, function(match) { return '~'; });
assertEquals("~~", str);

// Test zero-length matches that have non-zero-length sub-captures that do not
// start at the match start position.
str = "up up up up";
str = str.replace(/\b(?=u(p))/g, function(match, capture) {
                                    return capture.length;
                                  });

assertEquals("1up 1up 1up 1up", str);


// Create regexp that has a *lot* of captures.
var re_string = "(a)";
for (var i = 0; i < 500; i++) {
  re_string = "(" + re_string + ")";
}
re_string = re_string + "1";
// re_string = "(((...((a))...)))1"

var regexps = new Array();
var last_match_expectations = new Array();
var first_capture_expectations = new Array();

// Atomic regexp.
regexps.push(/a1/g);
last_match_expectations.push("a1");
first_capture_expectations.push("");
// Small regexp (no capture);
regexps.push(/\w1/g);
last_match_expectations.push("a1");
first_capture_expectations.push("");
// Small regexp (one capture).
regexps.push(/(a)1/g);
last_match_expectations.push("a1");
first_capture_expectations.push("a");
// Large regexp (a lot of captures).
regexps.push(new RegExp(re_string, "g"));
last_match_expectations.push("a1");
first_capture_expectations.push("a");

function test_replace(result_expectation,
                      subject,
                      regexp,
                      replacement) {
  for (var i = 0; i < regexps.length; i++) {
    // Overwrite last match info.
    "deadbeef".replace(/(dead)beef/, "$1holeycow");
    // Conduct tests.
    assertEquals(result_expectation, subject.replace(regexps[i], replacement));
    if (subject.length == 0) {
      assertEquals("deadbeef", RegExp.lastMatch);
      assertEquals("dead", RegExp["$1"]);
    } else {
      assertEquals(last_match_expectations[i], RegExp.lastMatch);
      assertEquals(first_capture_expectations[i], RegExp["$1"]);
    }
  }
}


function test_match(result_expectation,
                    subject,
                    regexp) {
  for (var i = 0; i < regexps.length; i++) {
    // Overwrite last match info.
    "deadbeef".replace(/(dead)beef/, "$1holeycow");
    // Conduct tests.
    if (result_expectation == null) {
      assertNull(subject.match(regexps[i]));
    } else {
      assertArrayEquals(result_expectation, subject.match(regexps[i]));
    }
    if (subject.length == 0) {
      assertEquals("deadbeef", RegExp.lastMatch);
      assertEquals("dead", RegExp["$1"]);
    } else {
      assertEquals(last_match_expectations[i], RegExp.lastMatch);
      assertEquals(first_capture_expectations[i], RegExp["$1"]);
    }
  }
}


// Test for different number of matches.
for (var m = 0; m < 33; m++) {
  // Create string that matches m times.
  var subject = "";
  var test_1_expectation = "";
  var test_2_expectation = "";
  var test_3_expectation = (m == 0) ? null : new Array();
  for (var i = 0; i < m; i++) {
    subject += "a11";
    test_1_expectation += "x1";
    test_2_expectation += "1";
    test_3_expectation.push("a1");
  }

  // Test 1a: String.replace with string.
  test_replace(test_1_expectation, subject, /a1/g, "x");

  // Test 1b: String.replace with function.
  function f() { return "x"; }
  test_replace(test_1_expectation, subject, /a1/g, f);

  // Test 2a: String.replace with empty string.
  test_replace(test_2_expectation, subject, /a1/g, "");

  // Test 3a: String.match.
  test_match(test_3_expectation, subject, /a1/g);
}


// Test String hashing (compiling regular expression includes hashing).
var crosscheck = "\x80";
for (var i = 0; i < 12; i++) crosscheck += crosscheck;
new RegExp(crosscheck);

var subject = "ascii~only~string~here~";
var replacement = "\x80";
var result = subject.replace(/~/g, replacement);
for (var i = 0; i < 5; i++) result += result;
new RegExp(result);