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Editorial Team
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Asked: 2026-06-15T16:58:10+00:00

I have keyword bolding function here: $ignore = array (‘div’, ‘class’, ‘high’, ‘light’, ‘highlight’);

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I have keyword “bolding” function here:

$ignore = array ('div', 'class', 'high', 'light', 'highlight');
$keywords = explode(' ', $qsvarus);
$title[$key] = preg_replace('/'.implode('|', $keywords).'/i', '<b>$0</b>', $title[$key]);
$infoo[$key] = preg_replace('/'.implode('|', $keywords).'/i', '<b>$0</b>', $infoo[$key]);

The problem is it sometimes catches some of my html tags. How to tell it to ignore everything shorter than 3 letters and certain specific words from $ignore array when <b></b> $keywords?

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1 Answer

  1. Editorial Team

    I would simply loop around the keywords array first, removing any matches in the ignore array (use in_array) and also any keywords that are 3 characters or less.

    Then if you want to make sure you are not in a tag, the following should suffice:

    /\b(keyword|keyword|keyword)\b(?![^<]*[>])/

    I’ve basically appended a negative lookahead:

    (?![^<]*[>])

    The regex will match as long as that look ahead for a closing html > not preceded by an opening tag < doesn’t match. I you do get a closing tag, you should be able* to assume that you are inside a tag.

    Putting that back into the preg_replace:

    preg_replace('/\b('.implode('|', $keywords).')\b(?![^<]*[>])/i', '<b>$1</b>', $subject);
    • This does assume that there isn’t an unencoded greater than (>)
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