JavaScript: Introduce class RegExpLiteralNode.

Author: Max Schaefer

javascript/ql/src/semmle/javascript/dataflow/Nodes.qll

@@ -530,6 +530,24 @@ class ArrayLiteralNode extends DataFlow::ValueNode, DataFlow::SourceNode {
   int getSize() { result = astNode.getSize() }
 }
 
+/**
+ * A data-flow node corresponding to a regular-expression literal.
+ *
+ * Examples:
+ * ```js
+ * /https?/i
+ * ```
+ */
+class RegExpLiteralNode extends DataFlow::ValueNode, DataFlow::SourceNode {
+  override RegExpLiteral astNode;
+
+  /** Holds if this regular expression has a `g` flag. */
+  predicate isGlobal() { astNode.isGlobal() }
+
+  /** Gets the root term of this regular expression. */
+  RegExpTerm getRoot() { result = astNode.getRoot() }
+}
+
 /**
  * A data flow node corresponding to a `new Array()` or `Array()` invocation.
  *