Fix: invalid regex used in cutAfterJS (#1137)

* support regex in `utils#cutAfterJSON`

* fix test and code

* add support for single and backtick quoted strings to cutAfterJSON

* yet another unit-test

* update comments

* fix regex & add another test

lib/utils.js

@@ -60,7 +60,7 @@ const ESCAPING_SEQUENZES = [
   { start: "'", end: "'" },
   { start: '`', end: '`' },
   // RegeEx
-  { start: '/', end: '/', startPrefix: /(^|[[{:;,])\s+$/ },
+  { start: '/', end: '/', startPrefix: /(^|[[{:;,])\s?$/ },
 ];
 
 /**

test/utils-test.js

@@ -64,9 +64,17 @@ describe('utils.cutAfterJS()', () => {
       '{"a": "\\"}1", "b": 1, "c": /[0-9]}}\\/}/}',
     );
   });
+  it('Tolerant to string with regexes in arrays ', () => {
+    assert.strictEqual(
+      // This does also tests "startPrefix" of the RegEx-Escaping-Sequenze
+      // I already screwed up the preceding whitespace rule once...
+      utils.cutAfterJS('{"a": [-1929233002,b,/,][}",],()}(\\[)/,2070160835,1561177444]}abcd'),
+      '{"a": [-1929233002,b,/,][}",],()}(\\[)/,2070160835,1561177444]}',
+    );
+  });
   it('does not fail for division followed by a regex', () => {
     assert.strictEqual(
-      utils.cutAfterJS('{"a": "\\"}1", "b": 1, "c": [4/6, /[0-9]}}\\/}/]}abcd', true),
+      utils.cutAfterJS('{"a": "\\"}1", "b": 1, "c": [4/6, /[0-9]}}\\/}/]}abcd'),
       '{"a": "\\"}1", "b": 1, "c": [4/6, /[0-9]}}\\/}/]}',
     );
   });