diff --git a/lib/desugar.h b/lib/desugar.h
index f0a9f28..87d9ab7 100644
--- a/lib/desugar.h
+++ b/lib/desugar.h
@@ -6,7 +6,7 @@
 #ifndef DESUGAR_H
 #define DESUGAR_H
 
-#include "parse.h"
+#include "regex.h"
 
 bool desugar_regex(parse_tree_t *regex);
 
diff --git a/lib/parse.c b/lib/parse.c
index 24e53b2..0bc95a6 100644
--- a/lib/parse.c
+++ b/lib/parse.c
@@ -5,7 +5,6 @@
 
 #include "parse.h"
 
-#include <stdbool.h>
 #include <stdlib.h>
 
 #define CLASS_START_CAPACITY 4
@@ -168,8 +167,8 @@ static int parse_sequence(const char *input, int rem, parse_sequence_t *out)
 				return -1;
 		}
 
-		result
-		    = parse_term(input + used, rem - used, &out->contents[out->count]);
+		result = parse_term(
+		    input + used, rem - used, &out->contents[out->count]);
 		if (result < 0)
 			break;
 		++out->count;
@@ -218,38 +217,3 @@ int parse_expr(const char *input, int rem, parse_tree_t *out)
 
 	return used;
 }
-
-void parse_free_tree_children(const parse_tree_t *t)
-{
-	if (NULL != t->contents) {
-		for (int i = 0; i < t->count; ++i)
-			parse_free_sequence_children(&t->contents[i]);
-		free(t->contents);
-	}
-}
-
-void parse_free_sequence_children(const parse_sequence_t *s)
-{
-	if (NULL != s->contents) {
-		for (int i = 0; i < s->count; ++i) {
-			switch (s->contents[i].type) {
-			case PARSE_TERM_CLASS:
-				parse_free_class_children(&s->contents[i].class);
-				break;
-			case PARSE_TERM_SUBEXPR:
-				parse_free_tree_children(&s->contents[i].subexpr);
-				break;
-			default:
-				break;
-			}
-		}
-		free(s->contents);
-	}
-}
-
-void parse_free_class_children(const parse_class_t *c)
-{
-	if (NULL != c->contents)
-		free(c->contents);
-}
-
diff --git a/lib/parse.h b/lib/parse.h
index a35b191..78dedc7 100644
--- a/lib/parse.h
+++ b/lib/parse.h
@@ -6,54 +6,8 @@
 #ifndef PARSE_H
 #define PARSE_H
 
-#include <stdbool.h>
-
-typedef struct {
-	bool negated;
-	int count, capacity;
-	char *contents;
-} parse_class_t;
-
-typedef enum {
-	PARSE_QUANTIFIER_NONE,
-	PARSE_QUANTIFIER_STAR,
-	PARSE_QUANTIFIER_PLUS,
-	PARSE_QUANTIFIER_QMARK,
-} parse_quantifier_t;
-
-typedef enum {
-	PARSE_TERM_WILDCARD,
-	PARSE_TERM_CLASS,
-	PARSE_TERM_LITERAL,
-	PARSE_TERM_SUBEXPR,
-	PARSE_TERM_EMPTY,
-} parse_term_type_t;
-
-struct _parse_term;
-typedef struct {
-	int count, capacity;
-	struct _parse_term *contents;
-} parse_sequence_t;
-
-typedef struct {
-	int count, capacity;
-	parse_sequence_t *contents;
-} parse_tree_t;
-
-typedef struct _parse_term {
-	parse_quantifier_t quantifier;
-	parse_term_type_t type;
-	union {
-		parse_class_t class;
-		char literal;
-		parse_tree_t subexpr;
-	};
-} parse_term_t;
+#include "regex.h"
 
 int parse_expr(const char *input, int rem, parse_tree_t *out);
 
-void parse_free_tree_children(const parse_tree_t *t);
-void parse_free_sequence_children(const parse_sequence_t *s);
-void parse_free_class_children(const parse_class_t *c);
-
 #endif
diff --git a/lib/regex.c b/lib/regex.c
new file mode 100644
index 0000000..ef1df48
--- /dev/null
+++ b/lib/regex.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#include "regex.h"
+
+#include <stdlib.h>
+
+void parse_free_tree_children(const parse_tree_t *t)
+{
+	if (NULL != t->contents) {
+		for (int i = 0; i < t->count; ++i)
+			parse_free_sequence_children(&t->contents[i]);
+		free(t->contents);
+	}
+}
+
+void parse_free_sequence_children(const parse_sequence_t *s)
+{
+	if (NULL != s->contents) {
+		for (int i = 0; i < s->count; ++i) {
+			switch (s->contents[i].type) {
+			case PARSE_TERM_CLASS:
+				parse_free_class_children(&s->contents[i].class);
+				break;
+			case PARSE_TERM_SUBEXPR:
+				parse_free_tree_children(&s->contents[i].subexpr);
+				break;
+			default:
+				break;
+			}
+		}
+		free(s->contents);
+	}
+}
+
+void parse_free_class_children(const parse_class_t *c)
+{
+	if (NULL != c->contents)
+		free(c->contents);
+}
diff --git a/lib/regex.h b/lib/regex.h
new file mode 100644
index 0000000..d2e2c7c
--- /dev/null
+++ b/lib/regex.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#ifndef REGEX_H
+#define REGEX_H
+
+#include <stdbool.h>
+
+typedef struct {
+	bool negated;
+	int count, capacity;
+	char *contents;
+} parse_class_t;
+
+typedef enum {
+	PARSE_QUANTIFIER_NONE,
+	PARSE_QUANTIFIER_STAR,
+	PARSE_QUANTIFIER_PLUS,
+	PARSE_QUANTIFIER_QMARK,
+} parse_quantifier_t;
+
+typedef enum {
+	PARSE_TERM_WILDCARD,
+	PARSE_TERM_CLASS,
+	PARSE_TERM_LITERAL,
+	PARSE_TERM_SUBEXPR,
+	PARSE_TERM_EMPTY,
+} parse_term_type_t;
+
+struct _parse_term;
+typedef struct {
+	int count, capacity;
+	struct _parse_term *contents;
+} parse_sequence_t;
+
+typedef struct {
+	int count, capacity;
+	parse_sequence_t *contents;
+} parse_tree_t;
+
+typedef struct _parse_term {
+	parse_quantifier_t quantifier;
+	parse_term_type_t type;
+	union {
+		parse_class_t class;
+		char literal;
+		parse_tree_t subexpr;
+	};
+} parse_term_t;
+
+void parse_free_tree_children(const parse_tree_t *t);
+void parse_free_sequence_children(const parse_sequence_t *s);
+void parse_free_class_children(const parse_class_t *c);
+
+#endif
diff --git a/scripts/build.sh b/scripts/build.sh
index f7b2401..1993c8c 100644
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -9,7 +9,8 @@ if [ ! -e build ]; then mkdir build; else rm build/*; fi
 # Build library
 clang $CFLAGS -Ilib -c lib/parse.c -o build/parse.o
 clang $CFLAGS -Ilib -c lib/desugar.c -o build/desugar.o
-ar -crs build/lib.a build/parse.o build/desugar.o
+clang $CFLAGS -Ilib -c lib/regex.c -o build/regex.o
+ar -crs build/lib.a build/parse.o build/desugar.o build/regex.o
 
 # Build tests
 clang $CFLAGS -Itests -c tests/testing.c -o build/testing.o