Quick Regex php - 从字符串中获取ID

Question

As anyone who's seen my posts will know, I'm a regex pleb. Anyone can tell me how to get the ID from this file name, would be very grateful?

/data/64786/sasf.zip

I need the 64786 bit from this line, always follows /data/ - anyone able to help quickly?

Answer 1

~/data/(\d+)/~

This will match a sequence of decimals (0-9) immediately following the string /data/ . Match is in group 1 .

If the string can also look like /data/64786 (ie, nothing after the number), use ~/data/(\\d+)~ instead. Actually, you can use this either way since \\d+ will be greedy per default and thus match as many decimals as possible. ( Tested at Rubular .)

Answer 2

This is a number. Use the \\d+ placeholder for ecimals:

preg_match("#(\d+)#", $str, $matches);
$id = $matches[1];

If the id always occurs at the same place, then you can add the slashes #/(\\d+)/# for reliability. Most text strings can be used as-is in regular expressions as anchors.

[reference, tools] https://stackoverflow.com/questions/89718/is-there-anything-like-regexbuddy-in-the-open-source-world

Answer 3

You could grab the ID using the following code:

$filename = '/data/64786/sasf.zip';
$prefix = '/data/';
$prefix_pos = strpos($filename, $prefix);

if($prefix_pos !== false)
{
    $prefix_pos_end = $prefix_pos + strlen($prefix);
    $slash_pos   = strpos($filename, '/', $prefix_pos_end);
    $id          = substr($filename, $prefix_pos_end, $slash_pos - $prefix_pos_end);
}
else    $id         = false;

Answer 4

你为什么不试试： basename （ dirname （“/ data / 64786 / sasf.zip”））