Quick Regex php - getting ID from a string

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?

jensgram · Accepted Answer · 2011-03-21 14:24:23Z

2

~/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 (i.e., 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.)

edited Mar 21, 2011 at 14:24

answered Mar 21, 2011 at 14:18

jensgram

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2 Comments

waxical Over a year ago

Though all others seem to work this was the best answer for the job. Thanks!

jensgram Over a year ago

@WiseDonkey You're welcome. When posting regexp questions you should take extra care to state both what's certain ("always follows /data/") and what varies (e.g., will there always be a slash after the ID?). This will reduce the amount of assumptions (and - not least - the following questioning of those) :)

Community · Accepted Answer · 2017-05-23 12:04:12Z

1

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

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

edited May 23, 2017 at 12:04

CommunityBot

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answered Mar 21, 2011 at 14:18

mario

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Comments

Michiel Pater · Accepted Answer · 2011-03-21 14:59:18Z

1

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;

edited Mar 21, 2011 at 14:59

answered Mar 21, 2011 at 14:19

Michiel Pater

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6 Comments

Mario Over a year ago

This might be faster than a regular expressionbut it will also not check the length of the ID (might be 5 or 500000 as well) and it won't check the beginning being "data".

Michiel Pater Over a year ago

@Mario: That is not correct. I am searching the ID using substring and beginning from position 6 (after '/data/'). Also, I am searching the slash after the ID. So if doesn't really matter if the number is 50 or 500000.

Mario Over a year ago

Yes, interpreted that part in the wrong way, however there's no guarantee it's indeed "/data/" in front of the number and the trailing slash can't be ommited.

jensgram Over a year ago

@Mario At least there's no guarantee (from what can be read in the question) that the /data/ (six chars) is at the beginning of the string/line.

Michiel Pater Over a year ago

@Mario: That is true, but does your answer guarantee it is indeed "/data/"?

|

AntonioCS · Accepted Answer · 2011-03-21 14:25:35Z

0

Why don't you try: basename(dirname("/data/64786/sasf.zip"))

answered Mar 21, 2011 at 14:25

AntonioCS

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1 Comment

Mario Over a year ago

This will break in case someone adds an additional "/" for whatever reason.

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