Fix recursion by number with group subtypes

Author: slevithan

spec/recursion-spec.js

@@ -108,6 +108,7 @@ describe('recursion', () => {
     it('should match direct recursion', () => {
       expect('aabb').toMatch(regex({plugins: [recursion]})`^(?<r>a\g<1&R=2>?b)$`);
       expect('aab').not.toMatch(regex({plugins: [recursion]})`^(?<r>a\g<1&R=2>?b)$`);
+      expect(() => regex({plugins: [recursion]})`^(a\g<1&R=2>?b)$`).toThrow();
       expect('aabb').toMatch(regex({plugins: [recursion], disable: {n: true}})`^(a\g<1&R=2>?b)$`);
       expect('aab').not.toMatch(regex({plugins: [recursion], disable: {n: true}})`^(a\g<1&R=2>?b)$`);
     });

src/index.js

@@ -3,7 +3,7 @@ import {Context, forEachUnescaped, getGroupContents, hasUnescaped, replaceUnesca
 const gRToken = String.raw`\\g<(?<gRNameOrNum>[^>&]+)&R=(?<gRDepth>[^>]+)>`;
 const recursiveToken = String.raw`\(\?R=(?<rDepth>[^\)]+)\)|${gRToken}`;
 const namedCapturingDelim = String.raw`\(\?<(?![=!])(?<captureName>[^>]+)>`;
-const token = new RegExp(String.raw`${namedCapturingDelim}|${recursiveToken}|\\?.`, 'gsu');
+const token = new RegExp(String.raw`${namedCapturingDelim}|${recursiveToken}|\(\?|\\?.`, 'gsu');
 const overlappingRecursionMsg = 'Cannot use multiple overlapping recursions';
 
 /**