JS: Added predicate to check if v flag is used on regular expression

Author: Napalys

javascript/ql/lib/semmle/javascript/Expr.qll

@@ -481,6 +481,9 @@ class RegExpLiteral extends @regexp_literal, Literal, RegExpParent {
   /** Holds if this regular expression has an `s` flag. */
   predicate isDotAll() { RegExp::isDotAll(this.getFlags()) }
 
+  /** Holds if this regular expression has an `v` flag. */
+  predicate isUnicodeSets() { RegExp::isUnicodeSets(this.getFlags()) }
+
   override string getAPrimaryQlClass() { result = "RegExpLiteral" }
 }
 

javascript/ql/lib/semmle/javascript/Regexp.qll

@@ -1162,6 +1162,10 @@ module RegExp {
   bindingset[flags]
   predicate isDotAll(string flags) { flags.matches("%s%") }
 
+  /** Holds if `flags` includes the `v` flag. */
+  bindingset[flags]
+  predicate isUnicodeSets(string flags) { flags.matches("%v%") }
+
   /** Holds if `flags` includes the `m` flag or is the unknown flag `?`. */
   bindingset[flags]
   predicate maybeMultiline(string flags) { flags = unknownFlag() or isMultiline(flags) }