正则表达式以匹配可能没有结尾定界符的项目

Question

I need to match both test1 and test3 in the sample URL below:

http://www.domain.com/:test1/test2/:test3

This regex isn't doing it:

(:.*?/?)

Any thoughts?

Answer 1

那是您要找的东西吗？

/:([^\/]+)/i

Answer 2

This one will do:

$str = 'http://www.domain.com/:test1/test2/:test3';
preg_match_all('~:\w+~', $str, $matches);
var_dump($matches);

Output:

array(1) {
  [0] =>
  array(2) {
    [0] =>
    string(6) ":test1"
    [1] =>
    string(6) ":test3"
  }
}

Explanation:

~    starting delimiter
:    a colon
\w   a *word* char
+    as many of them as possible
~    ending delimiter

Answer 3

I think that this might work for you :

$string = 'http://www.domain.com/:test1/test2/:test3';
preg_match_all('#:.*?/|:.*#i', $string, $matches);
var_dump($matches);

Answer 4

There's a little tutorial which explains how regex engines interpret ? and * here:

http://www.regex-engine.com/demo.html#repetition