fix: transform name capturing regex once (#10395)

* fix: transform name capturing regex once

* refactor: early return when pattern contains only lookbehind

* chore: simplify test regex

* chore: run test on >=8.0.0

packages/babel-plugin-transform-named-capturing-groups-regex/src/index.js

@@ -12,7 +12,7 @@ export default function({ types: t }, options) {
     visitor: {
       RegExpLiteral(path) {
         const node = path.node;
-        if (node.pattern.indexOf("(?<") === -1) {
+        if (!/\(\?<(?![=!])/.test(node.pattern)) {
           // Return early if there are no named groups.
           // The .indexOf check may have false positives (e.g. /\(?</); in
           // this case we parse the regex and regexp-tree won't transform it.

packages/babel-plugin-transform-named-capturing-groups-regex/test/fixtures/runtime/issue-10393/exec.js

@@ -0,0 +1,7 @@
+const regex = /(?<=a)(?<a>[a])/
+
+const result = regex.exec("aa");
+
+expect(result.groups).toEqual({
+  a: "a"
+});

packages/babel-plugin-transform-named-capturing-groups-regex/test/fixtures/runtime/issue-10393/options.json

@@ -0,0 +1,3 @@
+{
+  "minNodeVersion": "8.0.0"
+}