(Php) BBcode same tag in tag interesting nested problem

Question

This is my function.

class bbcode{
    var $bbcode_bb2html;
    function __construct($string){
            $this->bbcode_bb2html= $string;
    }
    function bbcode_parse_codes( ){
            $this->bbcode_bb2html = preg_replace("#\[code=(.*?)\](.*?)\[/code\]#si", "<pre data-snap-ignore=true class=language-\\1><code>\\2</code></pre>", $this->bbcode_bb2html);
            return $this->bbcode_bb2html;
    }
}
$content="[code=php]test message[/code]";
$bbcode = new bbcode($content);
echo $bbcode->bbcode_bb2html();

True result

<pre data-snap-ignore=true class=language-php><code>test message</code></pre>

But nested message not work. Sample;

$content="[code=php]test message [code=php]...[/code] bla bla bla[/code]";
$bbcode = new bbcode($content);
echo $bbcode->bbcode_bb2html();

False Result

<pre data-snap-ignore=true class=language-php><code>test message [code=php]...</code></pre> bla bla bla[/code]

function bbcode_bb2html(){ if ( empty($this->bbcode_bb2html) ){ return ( false ); } $this->bbcode_parse_codes( ); return $this->bbcode_bb2html; } — ulusanyazilim
– ulusanyazilim, Commented Jan 30, 2022 at 20:21

Wiktor Stribiżew · Accepted Answer · 2022-01-31 01:03:55Z

1

You can use

\[code=([^]]*)]([^[]*(?:\[(?!/code]|code=)[^[]*)*)\[/code]

and replace until no match is found. See the regex demo. Details:

\[code= - a [code= string
([^]]*) - Group 1: any zero or more chars other than ] char
] - a ] char
([^[]*(?:\[(?!/code]|code=)[^[]*)*) - Group 2: any zero or more chars other than a [ char, then zero or more occurrences of a [ char that is not immediately followed with /code] or code= and then zero or more chars other than a [ char
\[/code] - [/code] string.

In PHP code, it will look like

<?php

$text = '[code=php]test message [code=php]...[/code] bla bla bla[/code]';
$repl = '<pre data-snap-ignore=true class=language-$1><code>$2</code></pre>';
$count = 0;
do {
    $text = preg_replace('~\[code=([^]]*)]([^[]*(?:\[(?!/code]|code=)[^[]*)*)\[/code]~', $repl, $text, -1, $count);
} while ($count > 0);
echo $text;

Output:

<pre data-snap-ignore=true class=language-php><code>test message <pre data-snap-ignore=true class=language-php><code>...</code></pre> bla bla bla</code></pre>

To only get the surrounding tags you can use

(?s)\[code=([^]]*)]((?:(?!\[/?code\b).|(?R))*)\[/code]

See this regex demo. In PHP:

preg_replace('~\[code=([^]]*)]((?:(?!\[/?code\b).|(?R))*)\[/code]~s', $repl, $text)

edited Jan 31, 2022 at 1:03

answered Jan 30, 2022 at 22:31

Wiktor Stribiżew

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5 Comments

ulusanyazilim Over a year ago

Your answer should be like this., <pre data-snap-ignore=true class=language-php><code>test message [code=php]...[/code] bla bla bla</code></pre>

Wiktor Stribiżew Over a year ago

@ulusanyazilim In the end you will still need to convert all these codes to html, won't you?

ulusanyazilim Over a year ago

no, first and last tag only

Wiktor Stribiżew Over a year ago

@ulusanyazilim Then use regex recursion.

ulusanyazilim Over a year ago

sample bbcode [code]asd[code]asd[/code]asd[/code] your code output <pre><code>asd<pre><code>asd</code></pre>asd</code></pre> i want to be like this <pre><code>asd[code]asd[/code]asd</code></pre>

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