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    <p>Well, the obvious <em>easy</em> answer is to present your "summary" without any bbcode-driven markup at all (regex below taken from <a href="http://twelvestone.com/forum_thread/view/28916" rel="nofollow noreferrer">here</a>)</p> <pre><code>$summary = substr( preg_replace( '|[[\/\!]*?[^\[\]]*?]|si', '', $article ), 0, 200 ); </code></pre> <p>However, do do the job you explicitly describe is going to require more than just a regex. A lexer/parser would do the trick, but that's a moderately complicated topic. I'll see if I can come up w/something.</p> <h2>EDIT</h2> <p>Here's a pretty ghetto version of a lexer, but for this example it works. This converts an input string into bbcode tokens.</p> <pre><code>&lt;?php class SimpleBBCodeLexer { protected $tokens = array() , $patterns = array( self::TOKEN_OPEN_TAG =&gt; "/\\[[a-z].*?\\]/" , self::TOKEN_CLOSE_TAG =&gt; "/\\[\\/[a-z].*?\\]/" ); const TOKEN_TEXT = 'TEXT'; const TOKEN_OPEN_TAG = 'OPEN_TAG'; const TOKEN_CLOSE_TAG = 'CLOSE_TAG'; public function __construct( $input ) { for ( $i = 0, $l = strlen( $input ); $i &lt; $l; $i++ ) { $this-&gt;processChar( $input{$i} ); } $this-&gt;processChar(); } protected function processChar( $char=null ) { static $tokenFragment = ''; $tokenFragment = $this-&gt;processTokenFragment( $tokenFragment ); if ( is_null( $char ) ) { $this-&gt;addToken( $tokenFragment ); } else { $tokenFragment .= $char; } } protected function processTokenFragment( $tokenFragment ) { foreach ( $this-&gt;patterns as $type =&gt; $pattern ) { if ( preg_match( $pattern, $tokenFragment, $matches ) ) { if ( $matches[0] != $tokenFragment ) { $this-&gt;addToken( substr( $tokenFragment, 0, -( strlen( $matches[0] ) ) ) ); } $this-&gt;addToken( $matches[0], $type ); return ''; } } return $tokenFragment; } protected function addToken( $token, $type=self::TOKEN_TEXT ) { $this-&gt;tokens[] = array( $type =&gt; $token ); } public function getTokens() { return $this-&gt;tokens; } } $l = new SimpleBBCodeLexer( 'some [b]sample[/b] bbcode that [i] should [url="http://www.google.com"]support[/url] what [/i] you need.' ); echo '&lt;pre&gt;'; print_r( $l-&gt;getTokens() ); echo '&lt;/pre&gt;'; </code></pre> <p>The next step would be to create a parser that loops over these tokens and takes action as it encounters each type. Maybe I'll have time to make it later...</p>
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    1. POFinding a point in a string that is not inside BBCodes
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    1. COAdded the lexer example
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