使用正则表达式和php preg_match_all在括号之间获取字符串

Question

I have several texts with custom macro tags in it. I want to parse the content of these tags but I'd like to treat the ones with parameters in it differently.

I need to construct valid URLs out of these bracket contents.

Example:

This is my text:

{gallery}events/2016-02-18-Sunny-Sport-Day,single=IMG_0336.jpg,salign=left{/gallery}

Hey there! We had a great day with a tough but funny competition. Our team had a great race and was able to finish in second place.

{gallery}events/2016-02-18-Sunny-Sport-Day{/gallery}

{gallery}team/members{/gallery}

So I need to extract the path parts of the string between the {gallery} tags but I don't want to match those with parameters such as "single=IMG_0336.jpg,salign=left" because these are treated separately.

I need something which does the following:

{gallery}events/2016-02-18-Sunny-Sport-Day,single=IMG_0336.jpg,salign=left{/gallery}

becomes

first output: events/2016-02-18-Sunny-Sport-Day

second output: IMG_0336.jpg

and

{gallery}events/2016-02-18-Sunny-Sport-Day{/gallery}

becomes

events/2016-02-18-Sunny-Sport-Day

Tried the following regex:

/\{gallery\}(.*?)(?!single=)\{\/gallery\}/

But it allways matches the whole string including the single parameter.

To get the content of the single parameter I tried the following:

/,single=(.*?),/

This works fine for the single paramter only but I don't know how to get everything together.

Conclusion:

In a PHP environment I would like to have as output two arrays. The first consists only of the folders:

• events/2016-02-18-Sunny-Sport-Day
• team/members

and a second array which consists of the single file paths:

• events/2016-02-18-Sunny-Sport-Dayist/IMG_0336.jpg

Answer 1

This method will extract your desired substrings and prepare the output data as you have requested: Pattern Demo

PHP Code: (Demo)

$str="{gallery}events/2016-02-18-Sunny-Sport-Day,single=IMG_0336.jpg,salign=left{/gallery}

Hey there! We had a great day with a tough but funny competition. Our team had a great race and was able to finish in second place.

{gallery}events/2016-02-18-Sunny-Sport-Day{/gallery}

{gallery}team/members{/gallery}";
preg_match_all('@\{gallery\}([^,]*?)(?:,single=([^,{]+).*?)?\{/gallery\}@',$str,$out);

// Matches array:
var_export($out);

echo "

---

";

// Folders only array:
var_export(array_filter(array_slice($out,1)[0],'strlen'));

echo "

---

";

// Path + Image files array:
foreach($out[2] as $i=>$v){
    if($v){
        $result[]="{$out[1][$i]}/$v";
    }
}
var_export($result);\

Output:

array (
  0 => 
  array (
    0 => '{gallery}events/2016-02-18-Sunny-Sport-Day,single=IMG_0336.jpg,salign=left{/gallery}',
    1 => '{gallery}events/2016-02-18-Sunny-Sport-Day{/gallery}',
    2 => '{gallery}team/members{/gallery}',
  ),
  1 => 
  array (
    0 => 'events/2016-02-18-Sunny-Sport-Day',
    1 => 'events/2016-02-18-Sunny-Sport-Day',
    2 => 'team/members',
  ),
  2 => 
  array (
    0 => 'IMG_0336.jpg',
    1 => '',
    2 => '',
  ),
)

---
// Folders only array:
array (
  0 => 'events/2016-02-18-Sunny-Sport-Day',
  1 => 'events/2016-02-18-Sunny-Sport-Day',
  2 => 'team/members',
)

---
// Path + Image files array:
array (
  0 => 'events/2016-02-18-Sunny-Sport-Day/IMG_0336.jpg',
)