feat(regex-parser): support non-capturing groups

Author: gruhn

src/regex-parser.ts

@@ -102,7 +102,7 @@ const charSet = P.choice([
 ])
 
 const group = P.between(
-  P.string('('),
+  P.string('(').andThen(() => P.optional(P.string('?:'))),
   P.string(')'),
   regex(),
 )

test/regex-parser.spec.ts

@@ -31,6 +31,7 @@ describe('parseRegexString', () => {
     [/^\.$/, RE.literal(CharSet.singleton('.'))],
     [/^[a-z]$/, RE.literal(CharSet.charRange('a', 'z'))],
     [/^[^abc]$/, RE.literal(CharSet.complement(CharSet.fromArray(['a', 'b', 'c'])))],
+    [/^(?:ab)$/, RE.string('ab')], // non-capturing groups
   ])('can parse %s', (regexp, expected) => {
     expect(parseRegExp(regexp)).toEqual(expected)
   })