mirror of https://github.com/tc39/test262.git
36 lines
1.3 KiB
JavaScript
36 lines
1.3 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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description: >
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Test the groups object with matched and unmatched named captures.
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esid: sec-regexpbuiltinexec
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features: [regexp-named-groups]
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info: |
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Runtime Semantics: RegExpBuiltinExec ( R, S )
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24. If _R_ contains any |GroupName|, then
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a. Let _groups_ be ObjectCreate(*null*).
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25. Else,
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a. Let _groups_ be *undefined*.
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26. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_).
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---*/
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const re = /(?<a>a).|(?<x>x)/;
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const result = re.exec("ab");
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assert.sameValue(Object.getPrototypeOf(result), Array.prototype);
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assert(result.hasOwnProperty("groups"));
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assert.sameValue("ab", result[0]);
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assert.sameValue("a", result[1]);
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assert.sameValue(undefined, result[2]);
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assert.sameValue(0, result.index);
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assert.sameValue("a", result.groups.a);
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assert.sameValue(undefined, result.groups.x);
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// `a` is a matched named capture, `b` is an unmatched named capture, and `z`
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// is not a named capture.
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Array.prototype.groups = { a: "b", x: "y", z: "z" };
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assert.sameValue("a", "ab".replace(re, "$<a>"));
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assert.sameValue("", "ab".replace(re, "$<x>"));
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assert.sameValue("", "ab".replace(re, "$<z>"));
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Array.prototype.groups = undefined;
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