diff --git a/dist/index.js b/dist/index.js
index c7d73f4..6b94054 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -6782,17 +6782,26 @@ const REPLACERS = [
   [
     // (a\ ) -> (a )
     // (a  ) -> (a)
+    // (a ) -> (a)
     // (a \ ) -> (a  )
-    /\\?\s+$/,
-    match => match.indexOf('\\') === 0
-      ? SPACE
-      : EMPTY
+    /((?:\\\\)*?)(\\?\s+)$/,
+    (_, m1, m2) => m1 + (
+      m2.indexOf('\\') === 0
+        ? SPACE
+        : EMPTY
+    )
   ],
 
   // replace (\ ) with ' '
+  // (\ ) -> ' '
+  // (\\ ) -> '\\ '
+  // (\\\ ) -> '\\ '
   [
-    /\\\s/g,
-    () => SPACE
+    /(\\+?)\s/g,
+    (_, m1) => {
+      const {length} = m1
+      return m1.slice(0, length - length % 2) + SPACE
+    }
   ],
 
   // Escape metacharacters
@@ -7020,7 +7029,8 @@ const makeRegex = (pattern, ignoreCase) => {
 
   if (!source) {
     source = REPLACERS.reduce(
-      (prev, current) => prev.replace(current[0], current[1].bind(pattern)),
+      (prev, [matcher, replacer]) =>
+        prev.replace(matcher, replacer.bind(pattern)),
       pattern
     )
     regexCache[pattern] = source