php preg_replace problem

Question

$strSubject= preg_replace('/\b'.$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

alex · Accepted Answer · 2011-03-28 03:33:58Z

4

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);

answered Mar 28, 2011 at 3:33

alex

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1 Comment

@Weiqiu No worries, feel free to give me the big green tick :)