diff --git a/doc/reference/templates.md b/doc/reference/templates.md
index a2f400c3..f0af6699 100644
--- a/doc/reference/templates.md
+++ b/doc/reference/templates.md
@@ -290,10 +290,11 @@ If an expression evaluates to a falsy value, it will not be set at all:
 
 It is sometimes convenient to format an attribute with string interpolation. In
 that case, the `t-attf-` directive can be used. It is useful when we need to mix
-literal and dynamic elements, such as css classes.
+literal and dynamic elements, such as css classes. The dynamic elements can be
+specified with either `{{...}}` or `#{...}`:
 
 ```xml
-<div t-attf-foo="a {{value1}} is {{value2}} of {{value3}} ]"/>
+<div t-attf-foo="a {{value1}} is #{value2} of {{value3}} ]"/>
 <!-- result if values are set to 1,2 and 3: <div foo="a 0 is 1 of 2 ]"></div> -->
 ```
 
diff --git a/src/compiler/code_generator.ts b/src/compiler/code_generator.ts
index 766b4d06..f29d6ce9 100644
--- a/src/compiler/code_generator.ts
+++ b/src/compiler/code_generator.ts
@@ -1,4 +1,10 @@
-import { compileExpr, compileExprToArray, interpolate, INTERP_REGEXP } from "./inline_expressions";
+import {
+  compileExpr,
+  compileExprToArray,
+  interpolate,
+  INTERP_REGEXP,
+  replaceDynamicParts,
+} from "./inline_expressions";
 import {
   AST,
   ASTComment,
@@ -606,11 +612,8 @@ export class CodeGenerator {
       this.target.hasRef = true;
       const isDynamic = INTERP_REGEXP.test(ast.ref);
       if (isDynamic) {
-        const str = ast.ref.replace(
-          INTERP_REGEXP,
-          (expr) => "${" + this.captureExpression(expr.slice(2, -2), true) + "}"
-        );
-        const idx = block!.insertData(`(el) => refs[\`${str}\`] = el`, "ref");
+        const str = replaceDynamicParts(ast.ref, (expr) => this.captureExpression(expr, true));
+        const idx = block!.insertData(`(el) => refs[${str}] = el`, "ref");
         attrs["block-ref"] = String(idx);
       } else {
         let name = ast.ref;
diff --git a/src/compiler/inline_expressions.ts b/src/compiler/inline_expressions.ts
index e4df91ac..cca8c2f4 100644
--- a/src/compiler/inline_expressions.ts
+++ b/src/compiler/inline_expressions.ts
@@ -355,15 +355,20 @@ export function compileExpr(expr: string): string {
     .join("");
 }
 
-export const INTERP_REGEXP = /\{\{.*?\}\}/g;
-const INTERP_GROUP_REGEXP = /\{\{.*?\}\}/g;
+export const INTERP_REGEXP = /\{\{.*?\}\}|\#\{.*?\}/g;
 
-export function interpolate(s: string): string {
+export function replaceDynamicParts(s: string, replacer: (s: string) => string) {
   let matches = s.match(INTERP_REGEXP);
   if (matches && matches[0].length === s.length) {
-    return `(${compileExpr(s.slice(2, -2))})`;
+    return `(${replacer(s.slice(2, matches[0][0] === "{" ? -2 : -1))})`;
   }
 
-  let r = s.replace(INTERP_GROUP_REGEXP, (s) => "${" + compileExpr(s.slice(2, -2)) + "}");
+  let r = s.replace(
+    INTERP_REGEXP,
+    (s) => "${" + replacer(s.slice(2, s[0] === "{" ? -2 : -1)) + "}"
+  );
   return "`" + r + "`";
 }
+export function interpolate(s: string): string {
+  return replaceDynamicParts(s, compileExpr);
+}
diff --git a/tests/compiler/__snapshots__/attributes.test.ts.snap b/tests/compiler/__snapshots__/attributes.test.ts.snap
index 381886e8..941acce0 100644
--- a/tests/compiler/__snapshots__/attributes.test.ts.snap
+++ b/tests/compiler/__snapshots__/attributes.test.ts.snap
@@ -387,6 +387,20 @@ exports[`attributes static attributes with dashes 1`] = `
 }"
 `;
 
+exports[`attributes string interpolation, alternate syntax 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
+  
+  let block1 = createBlock(\`<div block-attribute-0=\\"foo\\"/>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    let attr1 = \`b\${ctx['value']}r\`;
+    return block1([attr1]);
+  }
+}"
+`;
+
 exports[`attributes t-att-class and class should combine together 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
diff --git a/tests/compiler/__snapshots__/t_ref.test.ts.snap b/tests/compiler/__snapshots__/t_ref.test.ts.snap
index adf155b6..db417dd1 100644
--- a/tests/compiler/__snapshots__/t_ref.test.ts.snap
+++ b/tests/compiler/__snapshots__/t_ref.test.ts.snap
@@ -16,6 +16,22 @@ exports[`t-ref can get a dynamic ref on a node 1`] = `
 }"
 `;
 
+exports[`t-ref can get a dynamic ref on a node, alternate syntax 1`] = `
+"function anonymous(app, bdom, helpers
+) {
+  let { text, createBlock, list, multi, html, toggler, component, comment } = bdom;
+  
+  let block1 = createBlock(\`<div><span block-ref=\\"0\\"/></div>\`);
+  
+  return function template(ctx, node, key = \\"\\") {
+    const refs = ctx.__owl__.refs;
+    const v1 = ctx['id'];
+    let ref1 = (el) => refs[\`myspan\${v1}\`] = el;
+    return block1([ref1]);
+  }
+}"
+`;
+
 exports[`t-ref can get a ref on a node 1`] = `
 "function anonymous(app, bdom, helpers
 ) {
@@ -99,7 +115,7 @@ exports[`t-ref refs in a loop 1`] = `
       const key1 = ctx['item'];
       const tKey_1 = ctx['item'];
       const v1 = ctx['item'];
-      let ref1 = (el) => refs[\`\${v1}\`] = el;
+      let ref1 = (el) => refs[(v1)] = el;
       let txt1 = ctx['item'];
       c_block2[i1] = withKey(block3([ref1, txt1]), tKey_1 + key1);
     }
diff --git a/tests/compiler/attributes.test.ts b/tests/compiler/attributes.test.ts
index 79374134..72c01869 100644
--- a/tests/compiler/attributes.test.ts
+++ b/tests/compiler/attributes.test.ts
@@ -131,6 +131,12 @@ describe("attributes", () => {
     expect(result).toBe(`<div foo="bar"></div>`);
   });
 
+  test("string interpolation, alternate syntax", () => {
+    const template = `<div t-attf-foo="b#{value}r"/>`;
+    const result = renderToString(template, { value: "a" });
+    expect(result).toBe(`<div foo="bar"></div>`);
+  });
+
   test("t-attf-class", () => {
     const template = `<div t-attf-class="hello"/>`;
     const result = renderToString(template);
diff --git a/tests/compiler/t_ref.test.ts b/tests/compiler/t_ref.test.ts
index cba367f4..0c4e1383 100644
--- a/tests/compiler/t_ref.test.ts
+++ b/tests/compiler/t_ref.test.ts
@@ -27,6 +27,15 @@ describe("t-ref", () => {
     expect(refs.myspan3.tagName).toBe("SPAN");
   });
 
+  test("can get a dynamic ref on a node, alternate syntax", () => {
+    const template = `<div><span t-ref="myspan#{id}"/></div>`;
+    const refs: any = {};
+    const bdom = renderToBdom(template, { id: 3, __owl__: { refs } });
+    expect(refs).toEqual({});
+    mount(bdom, document.createElement("div"));
+    expect(refs.myspan3.tagName).toBe("SPAN");
+  });
+
   test("refs in a loop", () => {
     const template = `<div>
         <t t-foreach="items" t-as="item" t-key="item">