diff --git a/src/compiler/utils/patterns.ts b/src/compiler/utils/patterns.ts
index 317a7c1990..06b2739259 100644
--- a/src/compiler/utils/patterns.ts
+++ b/src/compiler/utils/patterns.ts
@@ -1,3 +1,5 @@
 export const whitespace = /[ \t\r\n]/;
+export const startWhitespace = /^[ \t\r\n]*/;
+export const endWhitespace = /[ \t\r\n]*$/;
 
 export const dimensions = /^(?:offset|client)(?:Width|Height)$/;
diff --git a/src/compiler/utils/trim.ts b/src/compiler/utils/trim.ts
index 43f413bb1d..f9166fb4df 100644
--- a/src/compiler/utils/trim.ts
+++ b/src/compiler/utils/trim.ts
@@ -1,15 +1,9 @@
-import { whitespace } from './patterns';
+import { startWhitespace, endWhitespace } from './patterns';
 
 export function trim_start(str: string) {
-	let i = 0;
-	while (whitespace.test(str[i])) i += 1;
-
-	return str.slice(i);
+	return str.replace(startWhitespace, '');
 }
 
 export function trim_end(str: string) {
-	let i = str.length;
-	while (whitespace.test(str[i - 1])) i -= 1;
-
-	return str.slice(0, i);
+	return str.replace(endWhitespace, '');
 }