php regexp last match

Question

Condition: I have a peace of html code from wysiwig (Brief). I need to inject readmore link to the last paragrpaph (p-tag)

public function injectReadMore($html){
        if( $this->is_html($html) ){
            return preg_replace('#\<\/p\>$#isU',' <a href="javascript:void(0)" class="toggle-full-dsc">Читать полностью</a>$0', $html);
        } else {
            return '<p>'.$html.' <a href="javascript:void(0)" class="toggle-full-dsc">Читать полностью</a></p>';
        }
    }

Yep. What i wrote it's not right. Cuz if

$html = '<p>sdfgsdfg</p><div><p>sdfgsdfg</p> </div> ';

Fail.

Tried regexp's:

'#\<\/p\>[^p]+?$#isU'
'#\<\/p\>[^\/p]+?$#isU'
'#\<\/p\>[^[\/p]]+?$#isU'

and the same variants of RegExp. I don't understand something, maybe all;)

Help pls. Thanks, Brothers.

Barmar · Accepted Answer · 2013-07-22 21:39:12Z

2

This is easy to do with regular string replacement instead of regexp:

$pos = strripos($html, '</p>'); // Find last paragraph end
if ($pos !== false) { // Use exact matching, to distinguish 0 from false
    // Insert anchor before it
    $html = substr_replace($html, ' <a href="javascript:void(0)" class="toggle-full-dsc">Читать полностью</a>', $pos, 0);
}
return $html;

edited Jul 22, 2013 at 21:39

answered Jul 22, 2013 at 19:46

Barmar

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5 Comments

user428517 Over a year ago

what are you returning from?

Barmar Over a year ago

@sgroves The function in the question.

ZloyPotroh Over a year ago

I like this way, but strrpos returns false hard... (php 5.4.11)

Barmar Over a year ago

I had the arguments to strrpos() backwards (most PHP functions have the needle before the haystack). Fixed it, now it works.

Barmar Over a year ago

Changed to strripos() to be case-insensitive.

Valery Viktorovsky · Accepted Answer · 2013-07-22 20:00:29Z

2

You can use regex pattern with negative lookahead (?!…)

</p>(?!.*</p>)

regexp

Example: http://www.debuggex.com/r/rgV-ddCbL-BH_rL_/0

edited Jul 22, 2013 at 20:00

answered Jul 22, 2013 at 19:46

Valery Viktorovsky

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Comments

cmorrissey · Accepted Answer · 2013-07-22 20:05:50Z

1

Negative lookahead but remember to escape your html.

preg_replace('/\<\/p\>(?!.*\<\/p\>)/isU', '<a href="javascript:void(0)" class="toggle-full-dsc">Читать полностью</a></p>', $html);

answered Jul 22, 2013 at 20:05

cmorrissey

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