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Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
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feat: add support regexp buffer boundary assertions #65486

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775e2f4
feat: add support regexp buffer boundary assertions
a-tarasyuk Nov 13, 2026
ae16af3
Merge branch 'main' into feat/proposal-regexp-buffer-boundaries
a-tarasyuk Nov 14, 2026
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1 change: 1 addition & 0 deletions tsc/internal/diagnostics/diagnosticMessages.generated.json
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Original file line number Diff line number Diff line change
Expand Up @@ -1975,6 +1975,7 @@
"This_relative_import_path_is_unsafe_to_rewrite_because_it_appears_not_to_match_the_content_mapper_s__18139": "This relative import path is unsafe to rewrite because it appears not to match the content mapper's 'include', but does after resolution with 'rootDirs' and 'moduleSuffixes'.",
"File_0_has_a_registered_content_mapper_extension_but_does_not_match_any_content_mapper_s_include_18140": "File '{0}' has a registered content mapper extension but does not match any content mapper's 'include'.",
"Content_mapper_0_must_specify_extensions_in_tsconfig_or_its_package_manifest_18141": "Content mapper '{0}' must specify 'extensions' in tsconfig or its package manifest.",
"Regular_expression_buffer_boundary_assertions_are_only_available_when_targeting_esnext_18142": "Regular expression buffer boundary assertions are only available when targeting 'esnext'.",
"nodenext_if_module_is_nodenext_node16_if_module_is_node16_or_node18_otherwise_bundler_69010": "`nodenext` if `module` is `nodenext`; `node16` if `module` is `node16` or `node18`; otherwise, `bundler`.",
"File_is_a_CommonJS_module_it_may_be_converted_to_an_ES_module_80001": "File is a CommonJS module; it may be converted to an ES module.",
"This_constructor_function_may_be_converted_to_a_class_declaration_80002": "This constructor function may be converted to a class declaration.",
Expand Down
4 changes: 4 additions & 0 deletions tsc/internal/diagnostics/diagnosticMessages.json
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Expand Up @@ -9019,5 +9019,9 @@
"File '{0}' has a registered content mapper extension but does not match any content mapper's 'include'.": {
"category": "Error",
"code": 18140
},
"Regular expression buffer boundary assertions are only available when targeting 'esnext'.": {
"category": "Error",
"code": 18142
}
}
3 changes: 3 additions & 0 deletions tsc/internal/diagnostics/diagnostics_generated.go
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13 changes: 13 additions & 0 deletions tsc/internal/scanner/regexp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,9 @@ func (p *regExpParser) scanDisjunction(isInGroup bool) {
// | '(?!' Disjunction ')'
// | '(?<=' Disjunction ')'
// | '(?<!' Disjunction ')'
// | '\A'
// | '\z'
// | '\Z'
//
// Quantifier ::= QuantifierPrefix '?'?
// QuantifierPrefix ::=
Expand Down Expand Up @@ -236,6 +239,16 @@ func (p *regExpParser) scanAlternative(isInGroup bool) {
case 'b', 'B':
p.incPos(1)
isPreviousTermQuantifiable = false
case 'A', 'z', 'Z':
if p.anyUnicodeMode {
p.incPos(1)
if p.scanner.languageVersion() < core.ScriptTargetESNext {
p.error(diagnostics.Regular_expression_buffer_boundary_assertions_are_only_available_when_targeting_esnext, start, p.pos()-start)
}
isPreviousTermQuantifiable = false
break
}
fallthrough
default:
p.scanAtomEscape()
isPreviousTermQuantifiable = true
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228 changes: 228 additions & 0 deletions ...stdata/baselines/reference/compiler/regularExpressionAssertions(target=es2026).errors.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,228 @@
regularExpressionAssertions.ts(2,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(3,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(4,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(5,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(6,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(7,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(8,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(8,11): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(9,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(9,11): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(10,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(10,11): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(11,10): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(11,15): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(12,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(12,15): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(13,10): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(13,19): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(14,9): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(14,14): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(15,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(15,10): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(26,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(26,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(27,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(27,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(28,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(28,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(29,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(29,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(30,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(30,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(31,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(31,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(32,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(32,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(33,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(33,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(34,6): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(34,8): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(35,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(35,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(36,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(36,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(37,7): error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
regularExpressionAssertions.ts(37,9): error TS1507: There is nothing available for repetition.
regularExpressionAssertions.ts(39,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(40,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(41,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(42,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(43,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(44,7): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(45,8): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(46,10): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(46,13): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(46,16): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(48,6): error TS1535: This character cannot be escaped in a regular expression.
regularExpressionAssertions.ts(49,6): error TS1535: This character cannot be escaped in a regular expression.


==== regularExpressionAssertions.ts (58 errors) ====
const regexes: RegExp[] = [
/\A/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\z/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Z/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\A/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\z/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Z/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Afoo\z/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Afoo\Z/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Afoo\Z/gimsuy,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/(?m:\Afoo\z)/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Afoo|bar\z/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/(?<=\A)foo(?=\z)/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/(?:\Afoo\Z)+/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
/\Aa+\z/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.

/\A\z\Z/,
/\A*\z+\Z{1,2}?/,
/[\A\z\Z]/,
/[\A-\Z]/,

/\\A+\\z+\\Z+/u,
/[\\A\\z\\Z]/v,
/\u0041+\u007a+\u005a+/u,

/\A*/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~
!!! error TS1507: There is nothing available for repetition.
/\z+/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~
!!! error TS1507: There is nothing available for repetition.
/\Z?/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~
!!! error TS1507: There is nothing available for repetition.
/a\A{1}/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~
!!! error TS1507: There is nothing available for repetition.
/a\z{1,}/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~~
!!! error TS1507: There is nothing available for repetition.
/a\Z{1,2}?/u,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~~~~
!!! error TS1507: There is nothing available for repetition.
/\A*?/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS1507: There is nothing available for repetition.
/\z+?/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS1507: There is nothing available for repetition.
/\Z??/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~
!!! error TS1507: There is nothing available for repetition.
/a\A{1}/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~
!!! error TS1507: There is nothing available for repetition.
/a\z{1,}/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~~
!!! error TS1507: There is nothing available for repetition.
/a\Z{1,2}/v,
~~
!!! error TS18142: Regular expression buffer boundary assertions are only available when targeting 'esnext'.
~~~~~
!!! error TS1507: There is nothing available for repetition.

/[\A]/u,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\z]/u,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\Z]/u,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\A]/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\z]/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\Z]/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[[\A]&&[a]]/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/[\q{\A|\z|\Z}]/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
~~
!!! error TS1535: This character cannot be escaped in a regular expression.

/\a/u,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
/\a/v,
~~
!!! error TS1535: This character cannot be escaped in a regular expression.
];

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