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.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Guido van Rossum.
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" notice, this list of conditions and the following disclaimer.
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.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" @(#)fnmatch.3 8.3 (Berkeley) 4/28/95
.\" $FreeBSD: src/lib/libc/gen/fnmatch.3,v 1.12 2001/10/01 16:08:50 ru Exp $
.\"
.Dd April 28, 1995
.Dt FNMATCH 3
.Os
.Sh NAME
.Nm fnmatch
.Nd match filename or pathname
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In fnmatch.h
.Ft int
.Fn fnmatch "const char *pattern" "const char *string" "int flags"
.Sh DESCRIPTION
The
.Fn fnmatch
function
matches patterns according to the rules used by the shell.
It checks the string specified by the
.Fa string
argument to see if it matches the pattern specified by the
.Fa pattern
argument.
.Pp
The
.Fa flags
argument modifies the interpretation of
.Fa pattern
and
.Fa string .
The value of
.Fa flags
is the bitwise inclusive
.Tn OR
of any of the following
constants, which are defined in the include file
.Pa fnmatch.h .
.Bl -tag -width FNM_PATHNAME
.It Dv FNM_NOESCAPE
Normally, every occurrence of a backslash
.Pq Ql \e
followed by a character in
.Fa pattern
is replaced by that character.
This is done to negate any special meaning for the character.
If the
.Dv FNM_NOESCAPE
flag is set, a backslash character is treated as an ordinary character.
.It Dv FNM_PATHNAME
Slash characters in
.Fa string
must be explicitly matched by slashes in
.Fa pattern .
If this flag is not set, then slashes are treated as regular characters.
.It Dv FNM_PERIOD
Leading periods in
.Fa string
must be explicitly matched by periods in
.Fa pattern .
If this flag is not set, then leading periods are treated as regular
characters.
The definition of
.Dq leading
is related to the specification of
.Dv FNM_PATHNAME .
A period is always
.Dq leading
if it is the first character in
.Ar string .
Additionally, if
.Dv FNM_PATHNAME
is set,
a period is
leading
if it immediately follows a slash.
.It Dv FNM_LEADING_DIR
Ignore
.Nm /*
rest after successful
.Fa pattern
matching.
.It Dv FNM_CASEFOLD
Ignore case distinctions in both the
.Fa pattern
and the
.Fa string .
.El
.Sh RETURN VALUES
The
.Fn fnmatch
function returns zero if
.Fa string
matches the pattern specified by
.Fa pattern ,
otherwise, it returns the value
.Dv FNM_NOMATCH .
.Sh SEE ALSO
.Xr sh 1 ,
.Xr glob 3 ,
.Xr regex 3
.Sh STANDARDS
The
.Fn fnmatch
function conforms to
.St -p1003.2 .
.Sh HISTORY
The
.Fn fnmatch
function first appeared in
.Bx 4.4 .
.Sh BUGS
The pattern
.Ql *
matches the empty string, even if
.Dv FNM_PATHNAME
is specified.