搜索热词
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)'));
总结
如果觉得编程之家网站内容还不错,欢迎将编程之家网站推荐给程序员好友。
本图文内容来源于网友网络收集整理提供,作为学习参考使用,版权属于原作者。
如果觉得《php 匹配多个正则表达式 php – 正则表达式匹配无限数量的选项》对你有帮助,请点赞、收藏,并留下你的观点哦!