(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
fnmatch — Match filename against a pattern
fnmatch() checks if the passed filename would
match the given shell wildcard pattern.
pattern
The pattern to match against. Usually, the pattern will contain
wildcards like '?' and '*'.
| Wildcard | Description |
|---|---|
?
|
Question mark will match any single character.
For example, pattern "file?.txt" will match "file1.txt" and
"fileA.txt", but will not match "file10.txt".
|
*
|
Asterisk will match zero or more characters.
For example, pattern "foo*.xml" will match "foo.xml" and
"foobar.xml".
|
[ ]
|
Square brackets are used to create ranges of ASCII codepoints or sets of characters.
For example, pattern "index.php[45]" will match "index.php4" and
"index.php5", but will not match "index.phpt".
Well known ranges are [0-9], [a-z], and [A-Z].
Multiple sets and ranges can be used at the same time, for example [0-9a-zABC].
|
!
|
Exclamation mark is used to negate characters within square brackets.
For example, "[!A-Z]*.html" will match "demo.html", but will not match
"Demo.html".
|
\
|
Backslash is used to escape special characters.
For example, "Name\?" will match "Name?", but will not match
"Names".
|
filenameThe tested string. This function is especially useful for filenames, but may also be used on regular strings.
The average user may be used to shell patterns or at least in their
simplest form to '?' and '*'
wildcards so using fnmatch() instead of
preg_match() for
frontend search expression input may be way more convenient for
non-programming users.
flags
The value of flags can be any combination of
the following flags, joined with the
binary OR (|) operator.
Flag |
Description |
|---|---|
FNM_NOESCAPE |
Disable backslash escaping. |
FNM_PATHNAME |
Slash in string only matches slash in the given pattern. |
FNM_PERIOD |
Leading period in string must be exactly matched by period in the given pattern. |
FNM_CASEFOLD |
Caseless match. Part of the GNU extension. |
Example #1 Checking a color name against a shell wildcard pattern
<?php
if (fnmatch("*gr[ae]y", $color)) {
echo "some form of gray ...";
}
?>For now, this function is not available on non-POSIX compliant systems except Windows.
Here's a definitive solution, which supports negative character classes and the four documented flags.
<?php
if (!function_exists('fnmatch')) {
define('FNM_PATHNAME', 1);
define('FNM_NOESCAPE', 2);
define('FNM_PERIOD', 4);
define('FNM_CASEFOLD', 16);
function fnmatch($pattern, $string, $flags = 0) {
return pcre_fnmatch($pattern, $string, $flags);
}
}
function pcre_fnmatch($pattern, $string, $flags = 0) {
$modifiers = null;
$transforms = array(
'\*' => '.*',
'\?' => '.',
'\[\!' => '[^',
'\[' => '[',
'\]' => ']',
'\.' => '\.',
'\\' => '\\\\'
);
// Forward slash in string must be in pattern:
if ($flags & FNM_PATHNAME) {
$transforms['\*'] = '[^/]*';
}
// Back slash should not be escaped:
if ($flags & FNM_NOESCAPE) {
unset($transforms['\\']);
}
// Perform case insensitive match:
if ($flags & FNM_CASEFOLD) {
$modifiers .= 'i';
}
// Period at start must be the same as pattern:
if ($flags & FNM_PERIOD) {
if (strpos($string, '.') === 0 && strpos($pattern, '.') !== 0) return false;
}
$pattern = '#^'
. strtr(preg_quote($pattern, '#'), $transforms)
. '$#'
. $modifiers;
return (boolean)preg_match($pattern, $string);
}
?>
This probably needs further testing, but it seems to function identically to the native fnmatch implementation.An addition to my previous note: My statement regarding the FNM_* constants was wrong. They are available on POSIX-compliant systems (in other words, if fnmatch() is defined).There is a problem within the pcre_fnmatch-Function concerning backslashes. Those will be masked by preq_quote and ADDITONALLY by the strtr if FN_NOESCAPE is not set -> something like "*a(*" will finally result in "#^.*a\\(.*$#". Note the double backslash which effectively does NOT mask the "(" correctly.
Since preq_quote always matches a backslash I don't think that this'll work with using preg_quote at all.soywiz's function still doesn't seem to work -- at least not with PHP 5.2.3 on Windows -- but jk's does.soywiz's function didnt seem to work for me, but this did.
<?php
if(!function_exists('fnmatch')) {
function fnmatch($pattern, $string) {
return preg_match("#^".strtr(preg_quote($pattern, '#'), array('\*' => '.*', '\?' => '.'))."$#i", $string);
} // end
} // end if
?>About the windows compat functions below:
I needed fnmatch for a application that had to work on Windows, took a look here and tested both. Jk's works for me, soywiz didn't (on WinXPSP2, PHP 5.2.3).
The only difference between them is addcslashes (soywiz) instead of preg_quote (jk). They _should_ both work, but for some reason soywiz's didn't for me. So YMMV.
However, to make JK's fnmatch() work with the example in the documentation, you also have to strtr the [ and ] in $pattern.
<?php
$pattern = strtr(preg_quote($pattern, '#'), array('\*' => '.*', '\?' => '.', '\[' => '[', '\]' => ']'));
?>
And thanks for the functions, guys.you couls also try this function that I wrote before I found fnmatch:
function WildToReg($str)
{
$s = "";
for ($i = 0; $i < strlen($str); $i++)
{
$c = $str{$i};
if ($c =='?')
$s .= '.'; // any character
else if ($c == '*')
$s .= '.*'; // 0 or more any characters
else if ($c == '[' || $c == ']')
$s .= $c; // one of characters within []
else
$s .= '\\' . $c;
}
$s = '^' . $s . '$';
//trim redundant ^ or $
//eg ^.*\.txt$ matches exactly the same as \.txt$
if (substr($s,0,3) == "^.*")
$s = substr($s,3);
if (substr($s,-3,3) == ".*$")
$s = substr($s,0,-3);
return $s;
}
if (ereg(WildToReg("*.txt"), $fn))
print "$fn is a text file";
else
print "$fn is not a text file";