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diff --git a/lib/regextype.h b/lib/regextype.h
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+/* regextype.h -- Decode the name of a regular expression syntax.
+
+   Copyright 2005, 2010, 2011, 2015 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/* Written by James Youngman <jay@gnu.org>.
+ */
+
+/* Translate a regular expression type name into an option mask.
+ * This could convert "grep" into RE_SYNTAX_GREP, for example.
+ * Return -1 if there is no match.
+ */
+int get_regex_type(const char *s);
+
+enum {
+  CONTEXT_FINDUTILS = 1u,
+  CONTEXT_GENERIC   = 2u,
+  CONTEXT_ALL = CONTEXT_GENERIC|CONTEXT_FINDUTILS,
+};
+
+
+
+/* Returns the regex type name corresponding to index IX.
+ * Indexes start at 0.  Returns NULL if IX is too large.
+ */
+const char * get_regex_type_name(unsigned int ix);
+
+
+/* Returns the option mask name corresponding to regular expresion
+ * type index IX.  Indexes start at 0.  Behaviour is undefined if IX
+ * has a value which would cause get_regex_type_name to return NULL.
+ */
+int get_regex_type_flags(unsigned int ix);
+
+/* If regular expression type IX (which is a regular expression type index) has
+ * one or more synonyms, return the index of one of them.  Otherwise, return -1.
+ */
+int get_regex_type_synonym(unsigned int ix);
+
+/* Returns one of CONTEXT_FINDUTILS, CONTEXT_GENERIC or CONTEXT_ALL.
+ * This identifies whether this regular expression type index is relevant for,
+ * respectively, findutils, general callers, or all callers.
+ */
+unsigned int get_regex_type_context(unsigned int ix);