Enhance the wildcard to regexp conversion

lib/connectors/memory.js

@@ -363,8 +363,34 @@ function applyFilter(filter) {
     return pass;
   }
 
-  function replaceAll(string, find, replace) {
-    return string.replace(new RegExp(find, 'g'), replace);
+  function toRegExp(pattern) {
+    if (pattern instanceof RegExp) {
+      return pattern;
+    }
+    var regex = '';
+    pattern = pattern.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
+    for (var i = 0, n = pattern.length; i < n; i++) {
+      var char = pattern.charAt(i);
+      if (char === '\\') {
+        i++; // Skip to next char
+        if (i < n) {
+          regex += pattern.charAt(i);
+        }
+        continue;
+      } else if (char === '%') {
+        regex += '.*';
+      } else if (char === '_') {
+        regex += '.';
+      } else if (char === '.') {
+        regex += '\\.';
+      } else if (char === '*') {
+        regex += '\\*';
+      }
+      else {
+        regex += char;
+      }
+    }
+    return regex;
   }
 
   function test(example, value) {
@@ -394,8 +420,7 @@ function applyFilter(filter) {
 
         var like = example.like || example.nlike;
         if (typeof like === 'string') {
-          like = replaceAll(like, '%', '.*');
-          like = replaceAll(like, '_', '.');
+          like = toRegExp(like);
         }
         if (example.like) {
           return !!new RegExp(like).test(value);