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diff --git a/src/xregex.h b/src/xregex.h
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+++ b/src/xregex.h
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+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2022 Tavian Barnes <tavianator@tavianator.com> and bfs     *
+ * contributors                                                             *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+#ifndef BFS_XREGEX_H
+#define BFS_XREGEX_H
+
+/**
+ * A compiled regular expression.
+ */
+struct bfs_regex;
+
+/**
+ * Regex syntax flavors.
+ */
+enum bfs_regex_type {
+	BFS_REGEX_POSIX_BASIC,
+	BFS_REGEX_POSIX_EXTENDED,
+	BFS_REGEX_EMACS,
+	BFS_REGEX_GREP,
+};
+
+/**
+ * Regex compilation flags.
+ */
+enum bfs_regcomp_flags {
+	/** Treat the regex case-insensitively. */
+	BFS_REGEX_ICASE = 1 << 0,
+};
+
+/**
+ * Regex execution flags.
+ */
+enum bfs_regexec_flags {
+	/** Only treat matches of the entire string as successful. */
+	BFS_REGEX_ANCHOR = 1 << 0,
+};
+
+/**
+ * Wrapper for regcomp() that supports additional regex types.
+ *
+ * @param[out] preg
+ *         Will hold the compiled regex.
+ * @param pattern
+ *         The regular expression to compile.
+ * @param type
+ *         The regular expression syntax to use.
+ * @param flags
+ *         Regex compilation flags.
+ * @return
+ *         0 on success, -1 on failure.
+ */
+int bfs_regcomp(struct bfs_regex **preg, const char *pattern, enum bfs_regex_type type, enum bfs_regcomp_flags flags);
+
+/**
+ * Wrapper for regexec().
+ *
+ * @param regex
+ *         The regular expression to execute.
+ * @param str
+ *         The string to match against.
+ * @param flags
+ *         Regex execution flags.
+ * @return
+ *         1 for a match, 0 for no match, -1 on failure.
+ */
+int bfs_regexec(struct bfs_regex *regex, const char *str, enum bfs_regexec_flags flags);
+
+/**
+ * Free a compiled regex.
+ */
+void bfs_regfree(struct bfs_regex *regex);
+
+/**
+ * Get a human-readable regex error message.
+ *
+ * @param regex
+ *         The compiled regex.
+ * @return
+ *         A human-readable description of the error, which should be free()'d.
+ */
+char *bfs_regerror(const struct bfs_regex *regex);
+
+#endif // BFS_XREGEX_H