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 that we throw exceptions when calling test and exec with no
// input.  This is not part of the spec, but we do it for
// compatibility with JSC.
assertThrows("/a/.test()");
assertThrows("/a/.exec()");

// Test that we do not throw exceptions once the static RegExp.input
// field has been set.
RegExp.input = "a";
assertDoesNotThrow("/a/.test()");
assertDoesNotThrow("/a/.exec()");

// 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('abcd', 'abcd'.replace(re, f));