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fix: allow named backreferences without u flag in strict (#56)
* fix: allow named backreferences without u flag in strict * Update src/validator.ts Co-authored-by: Michael Schmidt <msrd0000@gmail.com> * chore: format and add comment * test: add test case for invalid --------- Co-authored-by: Michael Schmidt <msrd0000@gmail.com>
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3 files changed

+188
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‎src/validator.ts‎

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@@ -587,7 +587,12 @@ export class RegExpValidator {
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uFlag = false,
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): void {
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this._uFlag = uFlag && this.ecmaVersion >= 2015
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this._nFlag = uFlag && this.ecmaVersion >= 2018
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this._nFlag =
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(uFlag && this.ecmaVersion >= 2018) ||
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// Introduced as Normative Change in ES2023
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// See https://github.com/tc39/ecma262/pull/2436
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Boolean(this._options.strict && this.ecmaVersion >= 2023)
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this.reset(source, start, end)
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this.consumePattern()
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‎test/fixtures/parser/literal/named-backreferences-invalid-2022.json‎

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@@ -0,0 +1,14 @@
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{
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"options": {
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"strict": true,
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"ecmaVersion": 2022
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},
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"patterns": {
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"/(?<foo>A)\\k<foo>/": {
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"error": {
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"message": "Invalid regular expression: /(?<foo>A)\\k<foo>/: Invalid escape",
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"index": 11
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}
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}
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}
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}

‎test/fixtures/parser/literal/named-backreferences-valid-2023.json‎

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{
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"options": {
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"strict": true,
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"ecmaVersion": 2023
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},
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"patterns": {
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"/(?<foo>A)\\k<foo>/": {
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"ast": {
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"type": "RegExpLiteral",
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"parent": null,
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"start": 0,
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"end": 18,
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"raw": "/(?<foo>A)\\k<foo>/",
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"pattern": {
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"type": "Pattern",
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"parent": "♻️..",
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"start": 1,
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"end": 17,
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"raw": "(?<foo>A)\\k<foo>",
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"alternatives": [
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{
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"type": "Alternative",
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"parent": "♻️../..",
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"start": 1,
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"end": 17,
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"raw": "(?<foo>A)\\k<foo>",
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"elements": [
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{
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"type": "CapturingGroup",
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"parent": "♻️../..",
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"start": 1,
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"end": 10,
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"raw": "(?<foo>A)",
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"name": "foo",
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"alternatives": [
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{
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"type": "Alternative",
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"parent": "♻️../..",
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"start": 8,
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"end": 9,
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"raw": "A",
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"elements": [
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{
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"type": "Character",
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"parent": "♻️../..",
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"start": 8,
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"end": 9,
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"raw": "A",
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"value": 65
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}
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]
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}
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],
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"references": [
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"♻️../1"
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]
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},
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{
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"type": "Backreference",
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"parent": "♻️../..",
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"start": 10,
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"end": 17,
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"raw": "\\k<foo>",
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"ref": "foo",
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"resolved": "♻️../0"
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}
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]
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}
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]
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},
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"flags": {
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"type": "Flags",
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"parent": "♻️..",
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"start": 18,
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"end": 18,
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"raw": "",
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"global": false,
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"ignoreCase": false,
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"multiline": false,
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"unicode": false,
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"sticky": false,
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"dotAll": false,
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"hasIndices": false
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}
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}
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},
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"/(?<foo>A)\\k<foo>/u": {
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"ast": {
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"type": "RegExpLiteral",
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"parent": null,
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"start": 0,
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"end": 19,
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"raw": "/(?<foo>A)\\k<foo>/u",
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"pattern": {
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"type": "Pattern",
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"parent": "♻️..",
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"start": 1,
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"end": 17,
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"raw": "(?<foo>A)\\k<foo>",
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"alternatives": [
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{
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"type": "Alternative",
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"parent": "♻️../..",
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"start": 1,
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"end": 17,
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"raw": "(?<foo>A)\\k<foo>",
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"elements": [
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{
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"type": "CapturingGroup",
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"parent": "♻️../..",
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"start": 1,
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"end": 10,
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"raw": "(?<foo>A)",
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"name": "foo",
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"alternatives": [
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{
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"type": "Alternative",
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"parent": "♻️../..",
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"start": 8,
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"end": 9,
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"raw": "A",
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"elements": [
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{
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"type": "Character",
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"parent": "♻️../..",
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"start": 8,
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"end": 9,
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"raw": "A",
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"value": 65
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}
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]
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}
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],
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"references": [
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"♻️../1"
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]
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},
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{
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"type": "Backreference",
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"parent": "♻️../..",
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"start": 10,
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"end": 17,
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"raw": "\\k<foo>",
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"ref": "foo",
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"resolved": "♻️../0"
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}
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]
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}
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]
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},
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"flags": {
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"type": "Flags",
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"parent": "♻️..",
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"start": 18,
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"end": 19,
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"raw": "u",
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"global": false,
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"ignoreCase": false,
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"multiline": false,
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"unicode": true,
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"sticky": false,
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"dotAll": false,
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"hasIndices": false
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}
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}
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}
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}
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}

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