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我希望能够像这样解析文件路径：

/var/www/index.(htm|html|PHP|shtml)

进入有序数组：

array("htm","html","PHP","shtml")

然后生成一个备选列表：

/var/www/index.htm

/var/www/index.html

/var/www/index.PHP

/var/www/index.shtml

现在,我有一个preg_match语句可以拆分两个选项：

preg_match_all ("/\(([^)]*)\|([^)]*)\)/",$path_resource,$matches);

有人可以给我一个指针,如何扩展它以接受无限数量的替代品(至少两个)？关于正则表达式,其余的我可以处理.

规则是：

>列表需要以a开头(并以a结尾)

>必须有一个|在清单中(即至少两个备选方案)

>(或)的任何其他事件将保持不变.

更新：我需要能够处理多个括号对,例如：

/var/(www|www2)/index.(htm|html|PHP|shtml)

对不起,我没有马上说出来.

Update 2: If you’re looking to do what I’m trying to do in the filesystem,then note that glob() already brings this functionality out of the Box. There is no need to implement a custom solutiom. See @Gordon’s answer below for details.

非正则表达式解决方案:)

$test = '/var/www/index.(htm|html|PHP|shtml)';

/**

*

* @param string $str "/var/www/index.(htm|html|PHP|shtml)"

* @return array "/var/www/index.htm","/var/www/index.PHP",etc

*/

function expand_bracket_pair($str)

{

// Only get the very last "(" and ignore all others.

$bracketStartPos = strrpos($str,'(');

$bracketEndPos = strrpos($str,')');

// Split on ",".

$exts = substr($str,$bracketStartPos,$bracketEndPos - $bracketStartPos);

$exts = trim($exts,'()|');

$exts = explode('|',$exts);

// List all possible file names.

$names = array();

$prefix = substr($str,$bracketStartPos);

$affix = substr($str,$bracketEndPos + 1);

foreach ($exts as $ext)

{

$names[] = "{$prefix}{$ext}{$affix}";

}

return $names;

}

function expand_filenames($input)

{

$nbBrackets = substr_count($input,'(');

// Start with the last pair.

$sets = expand_bracket_pair($input);

// Now work backwards and recurse for each generated filename set.

for ($i = 0; $i < $nbBrackets; $i++)

{

foreach ($sets as $k => $set)

{

$sets = array_merge(

$sets,expand_bracket_pair($set)

);

}

}

// Clean up.

foreach ($sets as $k => $set)

{

if (false !== strpos($set,'('))

{

unset($sets[$k]);

}

}

$sets = array_unique($sets);

sort($sets);

return $sets;

}

var_dump(expand_filenames('/(a|b)/var/(www|www2)/index.(htm|html|PHP|shtml)'));

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