PHP preg_replace string path given - php

Question

I have issue with preg_replace function in PHP. I cant figure out a pattern and a replacement.
I have this two strings and some code:
$dirname1 = 'hdadas/dasdad/dasd/period_1min';
$dirname2 = 'hdadas/dasdad/dasd/period_1min/abcdrfg.php';
$pieces1 = explode('/', $dirname1);
$pieces2 = explode('/', $dirname2);
$dirname1 = end($pieces1); // output will be period_1min
$dirname2 = end($pieces2); // output will be abcdrfg.php
$output = preg_replace($pattern, $replacement, $dirname1); // or (..,..,$dirname2
echo $output; // i need 1min(without period_) or abcdrfg (without .php)
UPD:
function Cat($dirname)
{
$name = explode('/', $dirname);
$pattern = ???;
$replacement = ???;
return preg_replace($pattern, $replacement, $dirname1);
}
print(Cat('hdadas/dasdad/dasd/period_1min'))); // output need 1min only
print(Cat('hdadas/dasdad/dasd/period_1min/abcdrfg.php'))); // output need abcdrfg only

Answer 1

This should work for you:
(Here I use basename() to get only the last part of the path, then I use pathinfo() to get the last part without the extension. After this I just use preg_replace() to replace everything before the underscore with an empty string)
<?php
$dirname1 = "hdadas/dasdad/dasd/period_1min";
$dirname2 = "hdadas/dasdad/dasd/period_1min/abcdrfg.php";
$dirname1 = pathinfo(basename($dirname1))["filename"];
$dirname2 = pathinfo(basename($dirname2))["filename"];
echo $output = preg_replace("/(.*)_/", "", $dirname1);
?>
output:
1min
abcdrfg

Answer 2

How about this regex /^.+_|\.[^.]+$/:
$dirname1 = 'hdadas/dasdad/dasd/period_1min';
$dirname2 = 'hdadas/dasdad/dasd/period_1min/abcdrfg.php';
$pieces1 = explode('/', $dirname1);
$pieces2 = explode('/', $dirname2);
$dirname1 = end($pieces1); // output will be period_1min
$dirname2 = end($pieces2); // output will be abcdrfg.php
$output = preg_replace('/^.+_|\.[^.]+$/', '', $dirname1); // or (..,..,$dirname2
echo $output,"\n"; // i need 1min(without period_) or abcdrfg (without .php)
$output = preg_replace('/^.+_|\.[^.]+$/', '', $dirname2); // or (..,..,$dirname2
echo $output,"\n"; // i need 1min(without period_) or abcdrfg (without .php)
Output:
1min
abcdrfg