Deal with unescaped colons preceded by escaped backslashes when strip…

…ping pseudo classes

lib/stripPseudoClassesFromSelector.js

@@ -1,5 +1,5 @@
 const multiPseudoClassMatcher =
-  /(?<!\\)(?::(?:active|any|checked|default|empty|enabled|fullscreen|focus|hover|indeterminate|in-range|invalid|link|optional|out-of-range|read-only|read-write|scope|target|valid|visited))+/gi;
+  /(?<=(?<!\\)(?:\\\\)*)(?::(?:active|any|checked|default|empty|enabled|fullscreen|focus|hover|indeterminate|in-range|invalid|link|optional|out-of-range|read-only|read-write|scope|target|valid|visited))+/gi;
 
 const cssCombinators = [' ', '>', '+', '~', '/'];
 

test/stripPseudoClassesFromSelector.js

@@ -43,4 +43,20 @@ describe('stripPseudoClassesFromSelector', function () {
   it('should not strip when the colon is escaped by a backslash', function () {
     expect(strip('div\\:hover'), 'to be', 'div\\:hover');
   });
+
+  it('should strip when the colon is escaped by a backslash that is itself escaped', function () {
+    expect(strip('div\\\\:hover'), 'to be', 'div\\\\');
+  });
+
+  it('should not strip when the colon is escaped by a backslash that is preceded by an escaped backslash', function () {
+    expect(strip('div\\\\\\:hover'), 'to be', 'div\\\\\\:hover');
+  });
+
+  it('should strip when the colon is escaped by two backslashes that are themselves escaped', function () {
+    expect(strip('div\\\\\\\\:hover'), 'to be', 'div\\\\\\\\');
+  });
+
+  it('should not strip when the colon is escaped by a backslash that is preceded by two escaped backslashes', function () {
+    expect(strip('div\\\\\\\\\\:hover'), 'to be', 'div\\\\\\\\\\:hover');
+  });
 });