diff --git a/changelog_unreleased/angular/17722.md b/changelog_unreleased/angular/17722.md
index ce0026c87..ad5a44e13 100644
--- a/changelog_unreleased/angular/17722.md
+++ b/changelog_unreleased/angular/17722.md
@@ -1,19 +1,21 @@
-#### Support Angular 20.1 (#17722 by @fisker)
+#### Support Angular 21 (#17722, #18294 by @fisker)
 
 Angular 20.1 added support for new assignment operators.
+Angular 21 added support for regular expression.
 
 <!-- prettier-ignore -->
 ```html
 <!-- Input -->
 <b (click)="
-  a   ??= b"></b>
+  a   ??= b">{{  /\d+/g}}</b>
 
 <!-- Prettier stable -->
 <b
   (click)="
   a   ??= b"
-></b>
+  >{{  /\d+/g}}</b
+>
 
 <!-- Prettier main -->
-<b (click)="a ??= b"></b>
+<b (click)="a ??= b">{{ /\d+/g }}</b>
 ```
diff --git a/package.json b/package.json
index 637a4f2b8..01672aa5d 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "bin"
   ],
   "dependencies": {
-    "@angular/compiler": "20.3.13",
+    "@angular/compiler": "21.0.0",
     "@babel/code-frame": "8.0.0-beta.3",
     "@babel/parser": "8.0.0-beta.3",
     "@babel/types": "8.0.0-beta.3",
@@ -55,7 +55,7 @@
     "@typescript-eslint/visitor-keys": "8.47.0",
     "acorn": "8.15.0",
     "acorn-jsx": "5.3.2",
-    "angular-estree-parser": "13.1.3",
+    "angular-estree-parser": "14.1.0",
     "angular-html-parser": "10.1.1",
     "camelcase": "9.0.0",
     "ci-info": "4.3.1",
diff --git a/scripts/build/build-javascript-module.js b/scripts/build/build-javascript-module.js
index 7483adb60..2a67e2803 100644
--- a/scripts/build/build-javascript-module.js
+++ b/scripts/build/build-javascript-module.js
@@ -193,7 +193,7 @@ function getEsbuildOptions({ packageConfig, file, cliOptions }) {
       esbuildPluginEvaluate(),
       esbuildPluginStripNodeProtocol(),
       esbuildPluginReplaceModule({
-        replacements: [...replaceModule, ...(buildOptions.replaceModule ?? [])],
+        replacements: [...(buildOptions.replaceModule ?? []), ...replaceModule],
       }),
       cliOptions.reports &&
         esbuildPluginVisualizer({ formats: cliOptions.reports }),
diff --git a/scripts/build/transform/index.js b/scripts/build/transform/index.js
index d1d51885a..6a9df77d4 100644
--- a/scripts/build/transform/index.js
+++ b/scripts/build/transform/index.js
@@ -28,7 +28,7 @@ const packageTransforms = new Map([
     ["@glimmer/syntax", "angular-estree-parser", "espree"],
   ],
   [transforms["object-has-own"], ["@babel/parser", "meriyah"]],
-  [transforms["string-raw"], ["camelcase"]],
+  [transforms["string-raw"], ["camelcase", "@angular/compiler"]],
   /* spell-checker: enable */
 ]);
 
diff --git a/tests/format/angular/regular-expression/__snapshots__/format.test.js.snap b/tests/format/angular/regular-expression/__snapshots__/format.test.js.snap
new file mode 100644
index 000000000..559924771
--- /dev/null
+++ b/tests/format/angular/regular-expression/__snapshots__/format.test.js.snap
@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`regular-expression.html format 1`] = `
+====================================options=====================================
+parsers: ["angular"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+<b>{{       /\\d/+}}</b>
+<!-- Invalid regular expression -->
+<b>{{       /\\B*/u}}</b>
+
+=====================================output=====================================
+<b>{{       /\\d/+}}</b>
+<!-- Invalid regular expression -->
+<b>{{ /\\B*/u }}</b>
+
+================================================================================
+`;
diff --git a/tests/format/angular/regular-expression/format.test.js b/tests/format/angular/regular-expression/format.test.js
new file mode 100644
index 000000000..8cbc48b1a
--- /dev/null
+++ b/tests/format/angular/regular-expression/format.test.js
@@ -0,0 +1 @@
+runFormatTest(import.meta, ["angular"]);
diff --git a/tests/format/angular/regular-expression/regular-expression.html b/tests/format/angular/regular-expression/regular-expression.html
new file mode 100644
index 000000000..6766cad2e
--- /dev/null
+++ b/tests/format/angular/regular-expression/regular-expression.html
@@ -0,0 +1,3 @@
+<b>{{       /\d/+}}</b>
+<!-- Invalid regular expression -->
+<b>{{       /\B*/u}}</b>
diff --git a/yarn.lock b/yarn.lock
index 134159b9f..e556752a7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5,12 +5,12 @@ __metadata:
   version: 8
   cacheKey: 10
 
-"@angular/compiler@npm:20.3.13":
-  version: 20.3.13
-  resolution: "@angular/compiler@npm:20.3.13"
+"@angular/compiler@npm:21.0.0":
+  version: 21.0.0
+  resolution: "@angular/compiler@npm:21.0.0"
   dependencies:
     tslib: "npm:^2.3.0"
-  checksum: 10/1ee405f45292386a94a4a8596ec3b268d40257d579bdb6556034523daad42814770bc685ca1cebecb3c86fb1d7d06973ddd29935068f46c21aaad1ffe317ddef
+  checksum: 10/2cee4c6ebdec660dda703de5363dfe1c18c343065f01a00534e7bf018dd86c67b1a3ff0d151069020ac6e34d421c8466dff79c0186a93ccd494aa8ceadded727
   languageName: node
   linkType: hard
 
@@ -2827,12 +2827,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"angular-estree-parser@npm:13.1.3":
-  version: 13.1.3
-  resolution: "angular-estree-parser@npm:13.1.3"
+"angular-estree-parser@npm:14.1.0":
+  version: 14.1.0
+  resolution: "angular-estree-parser@npm:14.1.0"
   peerDependencies:
-    "@angular/compiler": ^20.3.4
-  checksum: 10/ada9814701dc17ef5c6186e1ea672aa9288bc67d28d00b6db86d5df4eaab5772572836f67e2b7d6a2e2be4b2051722dfc5de2295ef8f72361aada0c762d1bc8b
+    "@angular/compiler": ^21.0.0
+  checksum: 10/b9517dbdb9461d22ed0de5d3a19c82a520b7f45c2db4bc46990f5e5ad3fa948521e814edd88708bffeea9dca83225de4ff95c8b2e10cd7d432315b229024e39d
   languageName: node
   linkType: hard
 
@@ -7262,7 +7262,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "prettier@workspace:."
   dependencies:
-    "@angular/compiler": "npm:20.3.13"
+    "@angular/compiler": "npm:21.0.0"
     "@babel/code-frame": "npm:8.0.0-beta.3"
     "@babel/generator": "npm:8.0.0-beta.3"
     "@babel/parser": "npm:8.0.0-beta.3"
@@ -7283,7 +7283,7 @@ __metadata:
     "@typescript-eslint/visitor-keys": "npm:8.47.0"
     acorn: "npm:8.15.0"
     acorn-jsx: "npm:5.3.2"
-    angular-estree-parser: "npm:13.1.3"
+    angular-estree-parser: "npm:14.1.0"
     angular-html-parser: "npm:10.1.1"
     browserslist: "npm:4.28.0"
     browserslist-to-esbuild: "npm:2.1.1"