fix: transform Regex named capture groups for Golang

packages/runtime/src/helpers/edge.ts

@@ -11,7 +11,7 @@ import type { RouteHas } from 'next/dist/lib/load-custom-routes'
 import { outdent } from 'outdent'
 
 import { getRequiredServerFiles, NextConfig } from './config'
-import { makeLocaleOptional, stripLookahead } from './matchers'
+import { makeLocaleOptional, stripLookahead, transformCaptureGroups } from './matchers'
 
 // This is the format as of next@12.2
 interface EdgeFunctionDefinitionV1 {
@@ -237,7 +237,7 @@ const writeEdgeFunction = async ({
 
   // We add a defintion for each matching path
   return matchers.map((matcher) => {
-    const pattern = stripLookahead(matcher.regexp)
+    const pattern = transformCaptureGroups(stripLookahead(matcher.regexp))
     return { function: name, pattern, name: edgeFunctionDefinition.name }
   })
 }

packages/runtime/src/helpers/matchers.ts

@@ -24,6 +24,9 @@ export const stripLookahead = (regex: string) => {
   }
 }
 
+// The Go regexp lib has alternative syntax for named capture groups
+export const transformCaptureGroups = (regex: string) => regex.replace('(?<', '(?P<')
+
 const LOCALIZED_REGEX_PREFIX = '(?:\\/(_next\\/data\\/[^/]{1,}))?(?:\\/([^/.]{1,}))'
 const OPTIONAL_REGEX_PREFIX = '(?:\\/(_next\\/data\\/[^/]{1,}))?(?:\\/([^/.]{1,}))?'