v8/test/mjsunit/regexp-static.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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// Test the (deprecated as of JS 1.5) properties of the RegExp function.
var re = /((\d+)\.(\d+))/;
var s = 'abc123.456def';

re.exec(s);

assertEquals(s, RegExp.input);
assertEquals('123.456', RegExp.lastMatch);
assertEquals('456', RegExp.lastParen);
assertEquals('abc', RegExp.leftContext);
assertEquals('def', RegExp.rightContext);

assertEquals(s, RegExp['$_']);
assertEquals('123.456', RegExp['$&']);
assertEquals('456', RegExp['$+']);
assertEquals('abc', RegExp['$`']);
assertEquals('def', RegExp["$'"]);

assertEquals('123.456', RegExp['$1']);
assertEquals('123', RegExp['$2']);
assertEquals('456', RegExp['$3']);
for (var i = 4; i < 10; ++i) {
  assertEquals('', RegExp['$' + i]);
}

// They should be read only.
RegExp['$1'] = 'fisk';
assertEquals('123.456', RegExp['$1']);

// String.prototype.match and String.prototype.replace (when given a
// regexp) and also RegExp.prototype.test should all behave as if
// RegExp.prototype.exec were called.
s = 'ghi789.012jkl';
s.match(re);
assertEquals(s, RegExp.input);
assertEquals('789.012', RegExp.lastMatch);
assertEquals('012', RegExp.lastParen);
assertEquals('ghi', RegExp.leftContext);
assertEquals('jkl', RegExp.rightContext);
assertEquals(s, RegExp['$_']);
assertEquals('789.012', RegExp['$&']);
assertEquals('012', RegExp['$+']);
assertEquals('ghi', RegExp['$`']);
assertEquals('jkl', RegExp["$'"]);
assertEquals('789.012', RegExp['$1']);
assertEquals('789', RegExp['$2']);
assertEquals('012', RegExp['$3']);
for (var i = 4; i < 10; ++i) {
  assertEquals('', RegExp['$' + i]);
}

s = 'abc123.456def';
s.replace(re, 'whocares');
assertEquals(s, RegExp.input);
assertEquals('123.456', RegExp.lastMatch);
assertEquals('456', RegExp.lastParen);
assertEquals('abc', RegExp.leftContext);
assertEquals('def', RegExp.rightContext);
assertEquals(s, RegExp['$_']);
assertEquals('123.456', RegExp['$&']);
assertEquals('456', RegExp['$+']);
assertEquals('abc', RegExp['$`']);
assertEquals('def', RegExp["$'"]);
assertEquals('123.456', RegExp['$1']);
assertEquals('123', RegExp['$2']);
assertEquals('456', RegExp['$3']);
for (var i = 4; i < 10; ++i) {
  assertEquals('', RegExp['$' + i]);
}

s = 'ghi789.012jkl';
re.test(s);
assertEquals(s, RegExp.input);
assertEquals('789.012', RegExp.lastMatch);
assertEquals('012', RegExp.lastParen);
assertEquals('ghi', RegExp.leftContext);
assertEquals('jkl', RegExp.rightContext);
assertEquals(s, RegExp['$_']);
assertEquals('789.012', RegExp['$&']);
assertEquals('012', RegExp['$+']);
assertEquals('ghi', RegExp['$`']);
assertEquals('jkl', RegExp["$'"]);
assertEquals('789.012', RegExp['$1']);
assertEquals('789', RegExp['$2']);
assertEquals('012', RegExp['$3']);
for (var i = 4; i < 10; ++i) {
  assertEquals('', RegExp['$' + i]);
}

// String.prototype.replace must interleave matching and replacing when a
// global regexp is matched and replaced with the result of a function, in
// case the function uses the static properties of the regexp constructor.
re = /(.)/g;
function f() { return RegExp.$1; };
assertEquals('dddd', 'abcd'.replace(re, f));

// lastParen where the last parenthesis didn't match.
assertEquals(["foo",undefined], /foo(?:a(x))?/.exec("foobx"),
             "lastParen setup");
assertEquals("", RegExp.lastParen, "lastParen");

// The same test for $1 to $9.
for (var i = 1; i <= 9; i++) {
  var haystack = "foo";
  var re_text = "^foo";
  for (var j = 0; j < i - 1; j++) {
    haystack += "x";
    re_text += "(x)";
  }
  re_text += "(?:a(x))?";
  haystack += "bx";
  var re = new RegExp(re_text);
  assertTrue(re.test(haystack), "$" + i + " setup");
  for (var j = 1; j < i - 1; j++) {
    assertEquals("x", RegExp['$' + j], "$" + j + " in $" + i + " setup");
  }
  assertEquals("", RegExp['$' + (i)], "$" + i);
}

RegExp.input = Number();
assertTrue(typeof RegExp.input == typeof String(), "RegExp.input coerces values to booleans");

// Ensure that we save the correct string as the last subject when
// we do a match on a sliced string (the top one not the underlying).
var foo = "lsdfj sldkfj sdklfj læsdfjl sdkfjlsdk fjsdl fjsdljskdj flsj flsdkj flskd regexp: /foobar/\nldkfj sdlkfj sdkl";
assertTrue(/^([a-z]+): (.*)/.test(foo.substring(foo.indexOf("regexp:"))), "regexp: setup");
assertEquals("regexp", RegExp.$1, "RegExp.$1");


// Check that calling with no argument is the same as calling with undefined.
assertTrue(/^undefined$/.test());
assertEquals(["undefined"], /^undefined$/.exec());