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Asked: 2026-05-21T01:59:41+00:00

$strSubject= preg_replace(‘/\b’.$strWord.’\b/i’, ‘<b>’.$strWord.'</b>’, $strSubject); above code works in php 5.2.6 but not working in

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$strSubject= preg_replace('/\b'.$strWord.'\b/i', '<b>'.$strWord.'</b>', $strSubject);

above code works in php 5.2.6 but not working in php 5.2.9 and get ” warning,unknow modifer…..” error. please help

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1 Answer

  1. Editorial Team

    You probably have a meta character unescaped in $strWord. Try this…

    $strSubject= preg_replace('/\b'.preg_quote($strWord, '/').'\b/i', '<b>'.$strWord.'</b>', $strSubject);

    Also, you could just use this 🙂

    $strSubject = preg_replace('/\b('.preg_quote($strWord, '/').')\b/i', '<b>$1</b>', $strSubject);
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