diff --git a/node/declaration.test.ts b/node/declaration.test.ts
index ca700b26..59f59016 100644
--- a/node/declaration.test.ts
+++ b/node/declaration.test.ts
@@ -1,7 +1,7 @@
 import { test, expect } from 'vitest'
 
 import { FunctionConfig } from './config.js'
-import { Declaration, mergeDeclarations } from './declaration.js'
+import { Declaration, mergeDeclarations, parsePattern } from './declaration.js'
 
 const deployConfigDeclarations: Declaration[] = []
 
@@ -191,3 +191,19 @@ test('netlify.toml-defined excludedPath are respected', () => {
 
   expect(declarations).toEqual(expectedDeclarations)
 })
+
+test('Does not escape front slashes in a regex pattern if they are already escaped', () => {
+  const regexPattern = '^(?:\\/(_next\\/data\\/[^/]{1,}))?(?:\\/([^/.]{1,}))\\/shows(?:\\/(.*))(.json)?[\\/#\\?]?$'
+  const expected = '^(?:\\/(_next\\/data\\/[^\\/]{1,}))?(?:\\/([^\\/.]{1,}))\\/shows(?:\\/(.*))(.json)?[\\/#\\?]?$'
+  const actual = parsePattern(regexPattern)
+
+  expect(actual).toEqual(expected)
+})
+
+test('Escapes front slashes in a regex pattern', () => {
+  const regexPattern = '^(?:/(_next/data/[^/]{1,}))?(?:/([^/.]{1,}))/shows(?:/(.*))(.json)?[/#\\?]?$'
+  const expected = '^(?:\\/(_next\\/data\\/[^\\/]{1,}))?(?:\\/([^\\/.]{1,}))\\/shows(?:\\/(.*))(.json)?[\\/#\\?]?$'
+  const actual = parsePattern(regexPattern)
+
+  expect(actual).toEqual(expected)
+})
diff --git a/node/declaration.ts b/node/declaration.ts
index 143645af..9e284c3f 100644
--- a/node/declaration.ts
+++ b/node/declaration.ts
@@ -130,8 +130,9 @@ const createDeclarationsFromFunctionConfigs = (
 // Validates and normalizes a pattern so that it's a valid regular expression
 // in Go, which is the engine used by our edge nodes.
 export const parsePattern = (pattern: string) => {
-  // Escaping forward slashes with back slashes.
-  const normalizedPattern = pattern.replace(/\//g, '\\/')
+  // Only escape front slashes if they haven't been escaped already.
+  const normalizedPattern = pattern.replace(/(?<!\\)\//g, '\\/')
+
   const regex = regexpAST.transform(`/${normalizedPattern}/`, {
     Assertion(path) {
       // Lookaheads are not supported. If we find one, throw an error.