PHP - 有没有办法计算为您的需求而设计的正则表达式（正则表达式）？

Question

I'm trying to write the regex to search for image tags within a string, then to count them using either 'count' or 'substr_count'

EG: [image1], [image2] etc etc..

I'm an absolute rookie with regex so it's pretty confusing to me. Before anyone asks, yes I have done a little research into it, but I was just curious as to whether or not there is any shortcuts that are out there that myself and anyone else reading this may be missing out on.

I have also found the https://regex101.com/ however am clueless as to where to go from there.

My efforts for the example above are:

'~(\[image([\d])+\]~i'

and ..

'#[^a-z0-9.]#i'

If someone could show me how to search for the above, or point me in the right direction to a programming gold-mine it'd be more than appreciated.

Cheers, Rich

Answer 1

Use a preg_match_all, i.e.:

$string = <<< LOL
some text with image1 and another
part of that contains image2
yet another image3
LOL;

preg_match_all('/(image\d+)/i', $string, $matches, PREG_PATTERN_ORDER);
for ($i = 0; $i < count($matches[1]); $i++) {
    echo $matches[1][$i]."
";
}

---

OUTPUT:

image1
image2
image3

---

DEMO:

http://ideone.com/cQymaV