diff --git a/src/libregexp/regcomp.h b/src/libregexp/regcomp.h
new file mode 100644
index 0000000..a6728b0
--- /dev/null
+++ b/src/libregexp/regcomp.h
@@ -0,0 +1,74 @@
+/*
+ *  substitution list
+ */
+#define uchar __reuchar
+typedef unsigned char uchar;
+#define nelem(x) (sizeof(x)/sizeof((x)[0]))
+
+#define NSUBEXP 32
+typedef struct Resublist	Resublist;
+struct	Resublist
+{
+	Resub	m[NSUBEXP];
+};
+
+/* max character classes per program */
+extern Reprog	RePrOg;
+#define	NCLASS	(sizeof(RePrOg.class)/sizeof(Reclass))
+
+/* max rune ranges per character class */
+#define NCCRUNE	(sizeof(Reclass)/sizeof(Rune))
+
+/*
+ * Actions and Tokens (Reinst types)
+ *
+ *	02xx are operators, value == precedence
+ *	03xx are tokens, i.e. operands for operators
+ */
+#define RUNE		0177
+#define	OPERATOR	0200	/* Bitmask of all operators */
+#define	START		0200	/* Start, used for marker on stack */
+#define	RBRA		0201	/* Right bracket, ) */
+#define	LBRA		0202	/* Left bracket, ( */
+#define	OR		0203	/* Alternation, | */
+#define	CAT		0204	/* Concatentation, implicit operator */
+#define	STAR		0205	/* Closure, * */
+#define	PLUS		0206	/* a+ == aa* */
+#define	QUEST		0207	/* a? == a|nothing, i.e. 0 or 1 a's */
+#define	ANY		0300	/* Any character except newline, . */
+#define	ANYNL		0301	/* Any character including newline, . */
+#define	NOP		0302	/* No operation, internal use only */
+#define	BOL		0303	/* Beginning of line, ^ */
+#define	EOL		0304	/* End of line, $ */
+#define	CCLASS		0305	/* Character class, [] */
+#define	NCCLASS		0306	/* Negated character class, [] */
+#define	END		0377	/* Terminate: match found */
+
+/*
+ *  regexec execution lists
+ */
+#define LISTSIZE	10
+#define BIGLISTSIZE	(10*LISTSIZE)
+typedef struct Relist	Relist;
+struct Relist
+{
+	Reinst*		inst;		/* Reinstruction of the thread */
+	Resublist	se;		/* matched subexpressions in this thread */
+};
+typedef struct Reljunk	Reljunk;
+struct	Reljunk
+{
+	Relist*	relist[2];
+	Relist*	reliste[2];
+	int	starttype;
+	Rune	startchar;
+	char*	starts;
+	char*	eol;
+	Rune*	rstarts;
+	Rune*	reol;
+};
+
+extern Relist*	_renewthread(Relist*, Reinst*, Resublist*);
+extern void	_renewmatch(Resub*, int, Resublist*);
+extern Relist*	_renewemptythread(Relist*, Reinst*, char*);
+extern Relist*	_rrenewemptythread(Relist*, Reinst*, Rune*);