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diff --git a/src/options/strings_modes.h b/src/options/strings_modes.h
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+/*********************                                                        */
+/*! \file strings_modes.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Andres Noetzli
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
+ ** in the top-level source directory) and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Modes for the string solver.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef CVC4__THEORY__STRINGS__STRINGS_MODES_H
+#define CVC4__THEORY__STRINGS__STRINGS_MODES_H
+
+#include <iosfwd>
+
+namespace CVC4 {
+namespace theory {
+namespace strings {
+
+/** Enumeration of string processing loop modes */
+enum ProcessLoopMode
+{
+  /** Perform full loop processing. */
+  FULL,
+
+  /** Omit normal loop breaking. */
+  SIMPLE,
+
+  /** Abort if normal loop breaking is required. */
+  SIMPLE_ABORT,
+
+  /** Omit loop processing. */
+  NONE,
+
+  /** Abort if looping word equations are encountered. */
+  ABORT
+};  // enum ProcessLoopMode
+
+/** Enumeration of regular expression intersection modes */
+enum RegExpInterMode
+{
+  /** Compute intersections for all regular expressions. */
+  RE_INTER_ALL,
+
+  /**
+   * Compute intersections only for regular expressions without re.allchar
+   * and re.range.
+   */
+  RE_INTER_CONSTANT,
+
+  /**
+   * Compute intersections only between regular expressions where one side does
+   * not contain re.allchar and re.range.
+   */
+  RE_INTER_ONE_CONSTANT,
+
+  /** Do not compute intersections of regular expressions. */
+  RE_INTER_NONE,
+};  // enum RegExpInterMode
+
+}  // namespace strings
+}  // namespace theory
+
+std::ostream& operator<<(std::ostream& out,
+                         theory::strings::ProcessLoopMode mode);
+
+std::ostream& operator<<(std::ostream& out,
+                         theory::strings::RegExpInterMode mode);
+
+}  // namespace CVC4
+
+#endif /* CVC4__THEORY__STRINGS__STRINGS_MODES_H */