diff --git a/Userspace/libc/include/regex.h b/Userspace/libc/include/regex.h
new file mode 100644
index 00000000..81636aef
--- /dev/null
+++ b/Userspace/libc/include/regex.h
@@ -0,0 +1,68 @@
+/*
+	This file is part of Fennix C Library.
+
+	Fennix C Library is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix C Library is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix C Library. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#ifndef _REGEX_H
+#define _REGEX_H
+
+#include <sys/types.h>
+#include <stddef.h>
+
+typedef struct
+{
+	size_t re_nsub; /* Number of parenthesized subexpressions */
+} regex_t;
+
+typedef ptrdiff_t regoff_t;
+
+typedef struct
+{
+	regoff_t rm_so; /* Byte offset to start of substring */
+	regoff_t rm_eo; /* Byte offset after end of substring */
+} regmatch_t;
+
+/* Flags for regcomp() */
+#define REG_EXTENDED 0x01 /* Use Extended Regular Expressions */
+#define REG_ICASE 0x02	  /* Case-insensitive matching */
+#define REG_MINIMAL 0x04  /* Leftmost shortest match (for REG_EXTENDED) */
+#define REG_NOSUB 0x08	  /* Suppress subexpression reporting */
+#define REG_NEWLINE 0x10  /* Alter newline handling */
+
+/* Flags for regexec() */
+#define REG_NOTBOL 0x01 /* ^ does not match start of string */
+#define REG_NOTEOL 0x02 /* $ does not match end of string */
+
+/* Error codes */
+#define REG_NOMATCH 1  /* No match found */
+#define REG_BADPAT 2   /* Invalid regular expression */
+#define REG_ECOLLATE 3 /* Invalid collating element */
+#define REG_ECTYPE 4   /* Invalid character class */
+#define REG_EESCAPE 5  /* Trailing backslash */
+#define REG_ESUBREG 6  /* Invalid backreference */
+#define REG_EBRACK 7   /* Unbalanced '[]' */
+#define REG_EPAREN 8   /* Unbalanced '()' */
+#define REG_EBRACE 9   /* Unbalanced '{}' */
+#define REG_BADBR 10   /* Invalid content in {} */
+#define REG_ERANGE 11  /* Invalid range endpoint */
+#define REG_ESPACE 12  /* Memory exhaustion */
+#define REG_BADRPT 13  /* Invalid repetition operator */
+
+int regcomp(regex_t *restrict preg, const char *restrict pattern, int cflags);
+size_t regerror(int errcode, const regex_t *restrict preg, char *restrict errbuf, size_t errbuf_size);
+int regexec(const regex_t *restrict preg, const char *restrict string, size_t nmatch, regmatch_t pmatch[restrict], int eflags);
+void regfree(regex_t *preg);
+
+#endif /* _REGEX_H */