groups-object-unmatched.js (1317B)
1 // Copyright 2017 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: > 6 Test the groups object with matched and unmatched named captures. 7 esid: sec-regexpbuiltinexec 8 features: [regexp-named-groups] 9 info: | 10 Runtime Semantics: RegExpBuiltinExec ( R, S ) 11 24. If _R_ contains any |GroupName|, then 12 a. Let _groups_ be ObjectCreate(*null*). 13 25. Else, 14 a. Let _groups_ be *undefined*. 15 26. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_). 16 ---*/ 17 18 const re = /(?<a>a).|(?<x>x)/; 19 const result = re.exec("ab"); 20 assert.sameValue(Object.getPrototypeOf(result), Array.prototype); 21 assert(result.hasOwnProperty("groups")); 22 assert.sameValue("ab", result[0]); 23 assert.sameValue("a", result[1]); 24 assert.sameValue(undefined, result[2]); 25 assert.sameValue(0, result.index); 26 assert.sameValue("a", result.groups.a); 27 assert.sameValue(undefined, result.groups.x); 28 29 // `a` is a matched named capture, `b` is an unmatched named capture, and `z` 30 // is not a named capture. 31 Array.prototype.groups = { a: "b", x: "y", z: "z" }; 32 assert.sameValue("a", "ab".replace(re, "$<a>")); 33 assert.sameValue("", "ab".replace(re, "$<x>")); 34 assert.sameValue("", "ab".replace(re, "$<z>")); 35 Array.prototype.groups = undefined; 36 37 reportCompare(0, 0);