FIX: more efficient matching

common/header.html

@@ -101,9 +101,11 @@
     function processPlaceholders(placeholders, $cooked, mappings) {
       mappings.length = 0;
 
-      Object.keys(placeholders).map(placeholderKey => {
-        const placeholder = placeholders[placeholderKey];
-        const pattern = `(${placeholder.delimiter}(?:${placeholderKey})${placeholder.delimiter})`;
+      const keys = Object.keys(placeholders);
+      const pattern = keys.map(key => {
+        const placeholder = placeholders[key];
+        return `(${placeholder.delimiter}${key}${placeholder.delimiter})`;
+      }).join("|");
       const regex = new RegExp(pattern, "g");
 
       $cooked.find(VALID_TAGS).each((index, elem) => {
@@ -114,13 +116,12 @@
 
         while ((match = regex.exec(innerHTML)) != null) {
          mappings[index].push({
-              pattern: match[1],
+           pattern: match[0],
            position: match.index,
-              length: match[1].length
+           length: match[0].length
          });
         }
       });
-      });
     }
 
     $cooked.find(".d-wrap[data-wrap=placeholder]:not(.placeholdered)").each((index, elem) => {