如何在PHP中使用正则表达式提取管道之间的单词？

Question

I'm writing a parser and I need to extract words that are between double pipes using php

For example I want to extract the 'ipsum' from the string below

Lorem ||ipsum|| blah

If there are multiple words between double pipes, they should be extracted as well

Clarification

When I say multiple words I don't mean this: ||word another word||

I mean this

||Word1|| blah blah (newline)
blah ||Word2||

Clarification part 2

the ||quick|| brown fox ||jumps|| over the lazy ||dog|| 

What should be extracted should be the words 'quick', 'jumps' and 'dog'

Sorry for the confusion... There probably are some right answers below, I'll pick one once I confirm it tomorrow at work :)

Answer 1

What about a simple

$array = explode('||', $string);

After that, you probably want to trim the array values using trim().

See also http://www.php.net/explode and http://www.php.net/trim

Answer 2

Here is a regex solution: http://regex101.com/r/vE9pY9

 /\Q||\E[^|]+\Q||\E/

This will not accept pipes to be a part of the word though. If that is a requirement the regex has to be remade.

Answer 3

Try this:

if(preg_match('/\|\|(.*)\|\|/', $str, $matches) === 1){
    echo $matches[1];
}

Or if there are multiple || , try this:

if(preg_match_all('/\|\|(.*?)\|\|/', $str, $matches) !== FALSE){
    print_r($matches[1]);
}

Answer 4

I think I know what your looking for:

\|\|[a-zA-Z0-9]+\|\|

This should satisfy your example:

||Word1|| blah blah (newline)
blah ||Word2||

Of picking Word1 and Word2 out.

You will need to strip off the || on either side.

There is a way to use regex to strip the || out as well but KISS. It is easier to read and easier to, in general, strip this stuff out later. So you have a simple regex with a simple trim.

Hope it helps,