Use regex lexer for gathering named groups from has

.eslintignore

@@ -16,4 +16,5 @@ packages/next-codemod/**/*.js
 packages/next-codemod/**/*.d.ts
 packages/next-env/**/*.d.ts
 test/integration/async-modules/**
-test-timings.json
+test-timings.json
+packages/next/lib/regexr/**/*

docs/api-reference/next.config.js/headers.md

@@ -195,6 +195,9 @@ module.exports = {
           {
             type: 'query',
             key: 'page',
+            // the page value will not be available in the
+            // header key/values since value is provided and
+            // doesn't use a named capture group e.g. (?<page>home)
             value: 'home',
           },
           {

docs/api-reference/next.config.js/redirects.md

@@ -135,6 +135,9 @@ module.exports = {
           {
             type: 'query',
             key: 'page',
+            // the page value will not be available in the
+            // destination since value is provided and doesn't
+            // use a named capture group e.g. (?<page>home)
             value: 'home',
           },
           {

docs/api-reference/next.config.js/rewrites.md

@@ -214,6 +214,9 @@ module.exports = {
           {
             type: 'query',
             key: 'page',
+            // the page value will not be available in the
+            // destination since value is provided and doesn't
+            // use a named capture group e.g. (?<page>home)
             value: 'home',
           },
           {
@@ -222,7 +225,7 @@ module.exports = {
             value: 'true',
           },
         ],
-        destination: '/:path*/:page',
+        destination: '/:path*/home',
       },
       // if the header `x-authorized` is present and
       // contains a matching value, this rewrite will be applied

packages/next/lib/load-custom-routes.ts

@@ -8,7 +8,10 @@ import {
 } from '../next-server/lib/constants'
 import { execOnce } from '../next-server/lib/utils'
 import * as Log from '../build/output/log'
-import { getSafeParamName } from '../next-server/lib/router/utils/prepare-destination'
+// @ts-ignore
+import Lexer from 'next/dist/compiled/regexr-lexer/lexer'
+// @ts-ignore
+import lexerProfiles from 'next/dist/compiled/regexr-lexer/profiles'
 
 export type RouteHas =
   | {
@@ -336,20 +339,16 @@ function checkCustomRoutes(
 
         if (hasItem.value) {
           const matcher = new RegExp(`^${hasItem.value}$`)
-          const matches = matcher.exec('')
-
-          if (matches) {
-            if (matches.groups) {
-              Object.keys(matches.groups).forEach((groupKey) => {
-                const safeKey = getSafeParamName(groupKey)
-
-                if (safeKey && matches.groups![groupKey]) {
-                  hasSegments.add(safeKey)
-                }
-              })
-            } else {
-              hasSegments.add(hasItem.key || 'host')
-            }
+          const lexer = new Lexer()
+          lexer.profile = lexerProfiles.js
+          lexer.parse(`/${matcher.source}/`)
+
+          Object.keys(lexer.namedGroups).forEach((groupKey) => {
+            hasSegments.add(groupKey)
+          })
+
+          if (hasItem.type === 'host') {
+            hasSegments.add('host')
           }
         }
       }