share {js,rb}/regex/missing-regexp-anchor

python/ql/lib/semmle/python/RegexTreeView.qll

@@ -102,6 +102,9 @@ module Impl implements RegexTreeViewSig {
     /** Gets the number of child terms. */
     int getNumChild() { result = count(this.getAChild()) }
 
+    /** Gets the last child term of this element. */
+    RegExpTerm getLastChild() { result = this.getChild(this.getNumChild() - 1) }
+
     /** Gets the associated regex. */
     abstract Regex getRegex();
   }
@@ -561,6 +564,13 @@ module Impl implements RegexTreeViewSig {
     RegExpWordBoundary() { this.getChar() = "\\b" }
   }
 
+  /**
+   * A non-word boundary, that is, a regular expression term of the form `\B`.
+   */
+  class RegExpNonWordBoundary extends RegExpSpecialChar {
+    RegExpNonWordBoundary() { this.getChar() = "\\B" }
+  }
+
   /**
    * A character class escape in a regular expression.
    * That is, an escaped character that denotes multiple characters.
@@ -829,6 +839,19 @@ module Impl implements RegexTreeViewSig {
     override string getPrimaryQLClass() { result = "RegExpDot" }
   }
 
+  /**
+   * A term that matches a specific position between characters in the string.
+   *
+   * Example:
+   *
+   * ```
+   * \A
+   * ```
+   */
+  class RegExpAnchor extends RegExpSpecialChar {
+    RegExpAnchor() { this.getChar() = ["^", "$"] }
+  }
+
   /**
    * A dollar assertion `$` or `\Z` matching the end of a line.
    *
@@ -838,7 +861,7 @@ module Impl implements RegexTreeViewSig {
    * $
    * ```
    */
-  class RegExpDollar extends RegExpSpecialChar {
+  class RegExpDollar extends RegExpAnchor {
     RegExpDollar() { this.getChar() = ["$", "\\Z"] }
 
     override string getPrimaryQLClass() { result = "RegExpDollar" }
@@ -853,7 +876,7 @@ module Impl implements RegexTreeViewSig {
    * ^
    * ```
    */
-  class RegExpCaret extends RegExpSpecialChar {
+  class RegExpCaret extends RegExpAnchor {
     RegExpCaret() { this.getChar() = ["^", "\\A"] }
 
     override string getPrimaryQLClass() { result = "RegExpCaret" }