php 中的正则表达式快速帮助

Question

Im not proficient in regex at all, but I need to strip IDs from urls, that are from a large block of text.

URL look like this:

domain.com/path/ID_GOES_HERE

The problem is, its inside emails, which come in a wide variety of formats ranging from:

- <a href="http://www.domain.com/path/ID_GOES_HERE">http://www.domain.com/path/ID_GOES_HERE</a>
- www.domain.com/path/ID_GOES_HERE
- http://domain.com/path/ID_GOES
_HERE

The ID is letters and numbers only. No other characters of any kind.

EDIT: Another issue is, since Im processing emails, which are horribly formatted, sometimes the URL ends up at the end of the line, where it gets broken up between 2 lines, which puts an equal sign at the end, like so:

http://www.domain.com/path/EE33FDE291A=
8D972

So the ID gets deformed.

Answer 1

This should do what you need:

<?php
$matches = array();
preg_match_all('@domain\.com/path/((?:[a-z0-9_]|=\n)*)@i', $subject, $matches);
foreach ($matches[1] as $id) {
    $id = str_replace("=\n", '', $id);
    // Do your processing here.
}

Answer 2

preg_match('/^domain\.com\/path\/([a-zA-Z0-9]*)$/', $text, $matches = array());
if(isset($matches[1]))
  echo $matches[1];

Answer 3

try this regex

/(?:https?:\/\/)?(?:www.)?domain.com/path/([\d\w]+(?:\=?(?:\(?:[\r\n]|\r\n|)(?:[\d\w]+)?)?)/

seems to match all of your test cases