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diff --git a/src/regex__FFI.urs b/src/regex__FFI.urs
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+(* Copyright 2015 the Massachusetts Institute of Technology
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License.  You may obtain a copy of the
+License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations under the License. *)
+
+(* This is an internal module.  You should use the high-level API in Regex
+instead. *)
+
+
+(* A compiled regular expression. *)
+type regex
+
+(* Data about a match.  There is no function which returns all subexpression
+matches, as we can't build an Ur list in C. *)
+type match
+val succeeded : match -> bool
+val n_subexpression_matches : match -> int
+val subexpression_match : match -> int -> string
+
+
+(* Compiles a regular expression from a POSIX extended regular expression
+string. *)
+val compile : bool (* case sensitive? *) -> string -> regex
+
+(* Matches a regular expression against any part of a string. *)
+val do_match : regex -> string -> match