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35 lines
1.4 KiB
JavaScript
35 lines
1.4 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: Named backreferences in non-Unicode RegExps
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esid: prod-GroupSpecifier
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features: [regexp-named-groups]
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includes: [compareArray.js]
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---*/
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// Named references.
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assert.compareArray(["bab", "b"], "bab".match(/(?<b>.).\k<b>/));
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assert.sameValue(null, "baa".match(/(?<b>.).\k<b>/));
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// Reference inside group.
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assert.compareArray(["bab", "b"], "bab".match(/(?<a>\k<a>\w)../));
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assert.sameValue("b", "bab".match(/(?<a>\k<a>\w)../).groups.a);
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// Reference before group.
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assert.compareArray(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/));
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assert.sameValue("b", "bab".match(/\k<a>(?<a>b)\w\k<a>/).groups.a);
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assert.compareArray(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/));
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let {a, b} = "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/).groups;
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assert.sameValue(a, "a");
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assert.sameValue(b, "b");
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assert.compareArray(["bab", "b"], "bab".match(/\k<a>(?<a>b)\w\k<a>/));
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assert.compareArray(["bab", "b", "a"], "bab".match(/(?<b>b)\k<a>(?<a>a)\k<b>/));
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// Reference properties.
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assert.sameValue("a", /(?<a>a)(?<b>b)\k<a>/.exec("aba").groups.a);
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assert.sameValue("b", /(?<a>a)(?<b>b)\k<a>/.exec("aba").groups.b);
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assert.sameValue(undefined, /(?<a>a)(?<b>b)\k<a>/.exec("aba").groups.c);
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assert.sameValue(undefined, /(?<a>a)(?<b>b)\k<a>|(?<c>c)/.exec("aba").groups.c);
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