maint(core parser): Optimize regef for splitting multi-configs by enforcing whitespace around &&.

Author: thet

src/core/parser.js

@@ -443,7 +443,7 @@ class ArgumentParser {
             }
             const _parse = this._parse.bind(this);
             if (data.match(/&&/)) {
-                frame = data.split(/\s*&&\s*/).map(_parse);
+                frame = data.split(/\s+&&\s+/).map(_parse);
             } else {
                 frame = _parse(data);
             }