FunctionNode: Improve regex.

examples/jsm/nodes/core/FunctionNode.js

@@ -1,7 +1,7 @@
 import { TempNode } from './TempNode.js';
 import { NodeLib } from './NodeLib.js';
 
-var declarationRegexp = /^\s*([a-z_0-9]+)\s([a-z_0-9]+)\s*\((.*?)\)/i,
+var declarationRegexp = /^\s*([a-z_0-9]+)\s+([a-z_0-9]+)\s*\(([\s\S]*?)\)/i,
 	propertiesRegexp = /[a-z_0-9]+/ig;
 
 function FunctionNode( src, includes, extensions, keywords, type ) {