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diff --git a/Modules/regexpr.h b/Modules/regexpr.h
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+/*
+
+regexpr.h
+
+Author: Tatu Ylonen <ylo@ngs.fi>
+
+Copyright (c) 1991 Tatu Ylonen, Espoo, Finland
+
+Permission to use, copy, modify, distribute, and sell this software
+and its documentation for any purpose is hereby granted without fee,
+provided that the above copyright notice appear in all copies.  This
+software is provided "as is" without express or implied warranty.
+
+Created: Thu Sep 26 17:15:36 1991 ylo
+Last modified: Mon Nov  4 15:49:46 1991 ylo
+
+*/
+
+#ifndef REGEXPR_H
+#define REGEXPR_H
+
+#define RE_NREGS	10  /* number of registers available */
+
+typedef struct re_pattern_buffer
+{
+  char *buffer; 	 /* compiled pattern */
+  int allocated;	 /* allocated size of compiled pattern */
+  int used;		 /* actual length of compiled pattern */
+  char *fastmap;	 /* fastmap[ch] is true if ch can start pattern */
+  char *translate;	 /* translation to apply during compilation/matching */
+  char fastmap_accurate; /* true if fastmap is valid */
+  char can_be_null;	 /* true if can match empty string */
+  char uses_registers;	 /* registers are used and need to be initialized */
+  char anchor;		 /* anchor: 0=none 1=begline 2=begbuf */
+} *regexp_t;
+
+typedef struct re_registers
+{
+  int start[RE_NREGS];  /* start offset of region */
+  int end[RE_NREGS];    /* end offset of region */
+} *regexp_registers_t;
+
+/* bit definitions for syntax */
+#define RE_NO_BK_PARENS		1    /* no quoting for parentheses */
+#define RE_NO_BK_VBAR		2    /* no quoting for vertical bar */
+#define RE_BK_PLUS_QM		4    /* quoting needed for + and ? */
+#define RE_TIGHT_VBAR		8    /* | binds tighter than ^ and $ */
+#define RE_NEWLINE_OR		16   /* treat newline as or */
+#define RE_CONTEXT_INDEP_OPS	32   /* ^$?*+ are special in all contexts */
+#define RE_ANSI_HEX		64   /* ansi sequences (\n etc) and \xhh */
+#define RE_NO_GNU_EXTENSIONS   128   /* no gnu extensions */
+
+/* definitions for some common regexp styles */
+#define RE_SYNTAX_AWK	(RE_NO_BK_PARENS|RE_NO_BK_VBAR|RE_CONTEXT_INDEP_OPS)
+#define RE_SYNTAX_EGREP	(RE_SYNTAX_AWK|RE_NEWLINE_OR)
+#define RE_SYNTAX_GREP	(RE_BK_PLUS_QM|RE_NEWLINE_OR)
+#define RE_SYNTAX_EMACS	0
+
+#ifdef __STDC__
+
+int re_set_syntax(int syntax);
+/* This sets the syntax to use and returns the previous syntax.  The
+   syntax is specified by a bit mask of the above defined bits. */
+
+char *re_compile_pattern(char *regex, int regex_size, regexp_t compiled);
+/* This compiles the regexp (given in regex and length in regex_size).
+   This returns NULL if the regexp compiled successfully, and an error
+   message if an error was encountered.  The buffer field must be
+   initialized to a memory area allocated by malloc (or to NULL) before
+   use, and the allocated field must be set to its length (or 0 if buffer is
+   NULL).  Also, the translate field must be set to point to a valid
+   translation table, or NULL if it is not used. */
+
+int re_match(regexp_t compiled, char *string, int size, int pos,
+	     regexp_registers_t regs);
+/* This tries to match the regexp against the string.  This returns the
+   length of the matched portion, or -1 if the pattern could not be
+   matched and -2 if an error (such as failure stack overflow) is
+   encountered. */
+
+int re_match_2(regexp_t compiled, char *string1, int size1,
+	      char *string2, int size2, int pos, regexp_registers_t regs,
+	       int mstop);
+/* This tries to match the regexp to the concatenation of string1 and
+   string2.  This returns the length of the matched portion, or -1 if the
+   pattern could not be matched and -2 if an error (such as failure stack
+   overflow) is encountered. */
+
+int re_search(regexp_t compiled, char *string, int size, int startpos,
+	      int range, regexp_registers_t regs);
+/* This rearches for a substring matching the regexp.  This returns the first
+   index at which a match is found.  range specifies at how many positions to
+   try matching; positive values indicate searching forwards, and negative
+   values indicate searching backwards.  mstop specifies the offset beyond
+   which a match must not go.  This returns -1 if no match is found, and
+   -2 if an error (such as failure stack overflow) is encountered. */
+
+int re_search_2(regexp_t compiled, char *string1, int size1,
+		char *string2, int size2, int startpos, int range,
+		regexp_registers_t regs, int mstop);
+/* This is like re_search, but search from the concatenation of string1 and
+   string2.  */
+
+void re_compile_fastmap(regexp_t compiled);
+/* This computes the fastmap for the regexp.  For this to have any effect,
+   the calling program must have initialized the fastmap field to point
+   to an array of 256 characters. */
+
+char *re_comp(char *s);
+/* BSD 4.2 regex library routine re_comp.  This compiles the regexp into
+   an internal buffer.  This returns NULL if the regexp was compiled
+   successfully, and an error message if there was an error. */
+
+int re_exec(char *s);
+/* BSD 4.2 regexp library routine re_exec.  This returns true if the string
+   matches the regular expression (that is, a matching part is found
+   anywhere in the string). */
+
+#else /* __STDC__ */
+
+int re_set_syntax();
+char *re_compile_pattern();
+int re_match();
+int re_match_2();
+int re_search();
+int re_search_2();
+void re_compile_fastmap();
+char *re_comp();
+int re_exec();
+
+#endif /* __STDC__ */
+
+#endif /* REGEXPR_H */
+
+