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-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers-can-have-empty-remove-modifiers.js68
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers.js74
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-nested.js44
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js68
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-set-as-flags.js46
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/browser.js0
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-nested.js44
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-not-set-as-flags.js68
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-set-as-flags.js68
-rw-r--r--js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/shell.js0
10 files changed, 480 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers-can-have-empty-remove-modifiers.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers-can-have-empty-remove-modifiers.js
new file mode 100644
index 0000000000..9d5fd6c879
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers-can-have-empty-remove-modifiers.js
@@ -0,0 +1,68 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?ims-:)` is legal.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
+ 2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(removeModifiers)).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i-:)/;
+/(?is-:)/;
+/(?im-:)/;
+/(?s-:)/;
+/(?si-:)/;
+/(?sm-:)/;
+/(?m-:)/;
+/(?mi-:)/;
+/(?ms-:)/;
+/(?ims-:)/;
+/(?ism-:)/;
+/(?sim-:)/;
+/(?smi-:)/;
+/(?mis-:)/;
+/(?msi-:)/;
+new RegExp("(?i-:)");
+new RegExp("(?is-:)");
+new RegExp("(?im-:)");
+new RegExp("(?s-:)");
+new RegExp("(?si-:)");
+new RegExp("(?sm-:)");
+new RegExp("(?m-:)");
+new RegExp("(?mi-:)");
+new RegExp("(?ms-:)");
+new RegExp("(?ims-:)");
+new RegExp("(?ism-:)");
+new RegExp("(?sim-:)");
+new RegExp("(?smi-:)");
+new RegExp("(?mis-:)");
+new RegExp("(?msi-:)");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers.js
new file mode 100644
index 0000000000..728d47d3a0
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-and-remove-modifiers.js
@@ -0,0 +1,74 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?im-s:)` (and similar) is legal, as long as they do not overlap.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
+ 2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(removeModifiers)).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i-s:)/;
+/(?i-sm:)/;
+/(?i-m:)/;
+/(?i-ms:)/;
+/(?s-i:)/;
+/(?s-im:)/;
+/(?s-m:)/;
+/(?s-mi:)/;
+/(?m-i:)/;
+/(?m-is:)/;
+/(?m-s:)/;
+/(?m-si:)/;
+/(?is-m:)/;
+/(?im-s:)/;
+/(?si-m:)/;
+/(?sm-i:)/;
+/(?mi-s:)/;
+/(?ms-i:)/;
+new RegExp("(?i-s:)");
+new RegExp("(?i-sm:)");
+new RegExp("(?i-m:)");
+new RegExp("(?i-ms:)");
+new RegExp("(?s-i:)");
+new RegExp("(?s-im:)");
+new RegExp("(?s-m:)");
+new RegExp("(?s-mi:)");
+new RegExp("(?m-i:)");
+new RegExp("(?m-is:)");
+new RegExp("(?m-s:)");
+new RegExp("(?m-si:)");
+new RegExp("(?is-m:)");
+new RegExp("(?im-s:)");
+new RegExp("(?si-m:)");
+new RegExp("(?sm-i:)");
+new RegExp("(?mi-s:)");
+new RegExp("(?ms-i:)");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-nested.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-nested.js
new file mode 100644
index 0000000000..278633d304
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-nested.js
@@ -0,0 +1,44 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?ims:)` is legal, even when modifiers are already set via an outer non-capturing group.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by RegularExpressionFlags.
+ 2. Let removeModifiers be the empty String.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), removeModifiers).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i:(?i:))/;
+/(?s:(?s:))/;
+/(?m:(?m:))/;
+new RegExp("(?i:(?i:))");
+new RegExp("(?s:(?s:))");
+new RegExp("(?m:(?m:))");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js
new file mode 100644
index 0000000000..e288c833c6
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-not-set-as-flags.js
@@ -0,0 +1,68 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?ims:)` is legal.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by RegularExpressionFlags.
+ 2. Let removeModifiers be the empty String.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), removeModifiers).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i:)/;
+/(?is:)/;
+/(?im:)/;
+/(?s:)/;
+/(?si:)/;
+/(?sm:)/;
+/(?m:)/;
+/(?mi:)/;
+/(?ms:)/;
+/(?ims:)/;
+/(?ism:)/;
+/(?sim:)/;
+/(?smi:)/;
+/(?mis:)/;
+/(?msi:)/;
+new RegExp("(?i:)");
+new RegExp("(?is:)");
+new RegExp("(?im:)");
+new RegExp("(?s:)");
+new RegExp("(?si:)");
+new RegExp("(?sm:)");
+new RegExp("(?m:)");
+new RegExp("(?mi:)");
+new RegExp("(?ms:)");
+new RegExp("(?ims:)");
+new RegExp("(?ism:)");
+new RegExp("(?sim:)");
+new RegExp("(?smi:)");
+new RegExp("(?mis:)");
+new RegExp("(?msi:)");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-set-as-flags.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-set-as-flags.js
new file mode 100644
index 0000000000..f1d5cedc83
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/add-modifiers-when-set-as-flags.js
@@ -0,0 +1,46 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?ims:)` is legal, even when modifiers are already set via flags.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by RegularExpressionFlags.
+ 2. Let removeModifiers be the empty String.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), removeModifiers).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?i:)/i;
+/(?s:)/s;
+/(?m:)/m;
+/(?ims:)/ims;
+new RegExp("(?i:)", "i");
+new RegExp("(?s:)", "s");
+new RegExp("(?m:)", "m");
+new RegExp("(?ims:)", "ims");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/browser.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/browser.js
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-nested.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-nested.js
new file mode 100644
index 0000000000..90d5e5e606
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-nested.js
@@ -0,0 +1,44 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?-ims:)` is legal, even when modifiers are already cleared via an outer non-capturing group.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
+ 2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(removeModifiers)).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?-i:(?-i:))/;
+/(?-s:(?-s:))/;
+/(?-m:(?-m:))/;
+new RegExp("(?-i:(?-i:))");
+new RegExp("(?-s:(?-s:))");
+new RegExp("(?-m:(?-m:))");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-not-set-as-flags.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-not-set-as-flags.js
new file mode 100644
index 0000000000..397e94ce6b
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-not-set-as-flags.js
@@ -0,0 +1,68 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?-ims:)` is legal, even when not set as flags.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
+ 2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(removeModifiers)).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?-i:)/;
+/(?-is:)/;
+/(?-im:)/;
+/(?-s:)/;
+/(?-si:)/;
+/(?-sm:)/;
+/(?-m:)/;
+/(?-mi:)/;
+/(?-ms:)/;
+/(?-ims:)/;
+/(?-ism:)/;
+/(?-smi:)/;
+/(?-sim:)/;
+/(?-mis:)/;
+/(?-msi:)/;
+new RegExp("(?-i:)");
+new RegExp("(?-is:)");
+new RegExp("(?-im:)");
+new RegExp("(?-s:)");
+new RegExp("(?-si:)");
+new RegExp("(?-sm:)");
+new RegExp("(?-m:)");
+new RegExp("(?-mi:)");
+new RegExp("(?-ms:)");
+new RegExp("(?-ims:)");
+new RegExp("(?-ism:)");
+new RegExp("(?-smi:)");
+new RegExp("(?-sim:)");
+new RegExp("(?-mis:)");
+new RegExp("(?-msi:)");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-set-as-flags.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-set-as-flags.js
new file mode 100644
index 0000000000..1b96c747a8
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/remove-modifiers-when-set-as-flags.js
@@ -0,0 +1,68 @@
+// |reftest| skip -- regexp-modifiers is not supported
+// Copyright 2023 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Ron Buckton
+description: >
+ Modifiers syntax `(?-ims:)` is legal.
+info: |
+ Runtime Semantics: CompileAtom
+ The syntax-directed operation CompileAtom takes arguments direction (forward or backward) and modifiers (a Modifiers Record) and returns a Matcher.
+
+ Atom :: `(` `?` RegularExpressionFlags `-` RegularExpressionFlags `:` Disjunction `)`
+ 1. Let addModifiers be the source text matched by the first RegularExpressionFlags.
+ 2. Let removeModifiers be the source text matched by the second RegularExpressionFlags.
+ 3. Let newModifiers be UpdateModifiers(modifiers, CodePointsToString(addModifiers), CodePointsToString(removeModifiers)).
+ 4. Return CompileSubpattern of Disjunction with arguments direction and newModifiers.
+
+ UpdateModifiers ( modifiers, add, remove )
+ The abstract operation UpdateModifiers takes arguments modifiers (a Modifiers Record), add (a String), and remove (a String) and returns a Modifiers. It performs the following steps when called:
+
+ 1. Let dotAll be modifiers.[[DotAll]].
+ 2. Let ignoreCase be modifiers.[[IgnoreCase]].
+ 3. Let multiline be modifiers.[[Multiline]].
+ 4. If add contains "s", set dotAll to true.
+ 5. If add contains "i", set ignoreCase to true.
+ 6. If add contains "m", set multiline to true.
+ 7. If remove contains "s", set dotAll to false.
+ 8. If remove contains "i", set ignoreCase to false.
+ 9. If remove contains "m", set multiline to false.
+ 10. Return the Modifiers Record { [[DotAll]]: dotAll, [[IgnoreCase]]: ignoreCase, [[Multiline]]: multiline }.
+
+esid: sec-compileatom
+features: [regexp-modifiers]
+---*/
+
+/(?-i:)/i;
+/(?-is:)/is;
+/(?-im:)/im;
+/(?-s:)/s;
+/(?-si:)/si;
+/(?-sm:)/sm;
+/(?-m:)/m;
+/(?-mi:)/mi;
+/(?-ms:)/ms;
+/(?-ims:)/ims;
+/(?-ism:)/ism;
+/(?-sim:)/sim;
+/(?-smi:)/smi;
+/(?-mis:)/mis;
+/(?-msi:)/msi;
+new RegExp("(?-i:)", "i");
+new RegExp("(?-is:)", "is");
+new RegExp("(?-im:)", "im");
+new RegExp("(?-s:)", "s");
+new RegExp("(?-si:)", "si");
+new RegExp("(?-sm:)", "sm");
+new RegExp("(?-m:)", "m");
+new RegExp("(?-mi:)", "mi");
+new RegExp("(?-ms:)", "ms");
+new RegExp("(?-ims:)", "ims");
+new RegExp("(?-ism:)", "ism");
+new RegExp("(?-sim:)", "sim");
+new RegExp("(?-smi:)", "smi");
+new RegExp("(?-mis:)", "mis");
+new RegExp("(?-msi:)", "msi");
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/shell.js b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/regexp-modifiers/syntax/valid/shell.js