Re: str_replace on words?

Duncan Hill wrote:

On Wednesday 11 May 2005 17:13, Merlin wrote:

Hi there, I am trying to strip some words from a sentence. I tried it with str_replace like described here: http://www.totallyphp.co.uk/code/find_and_replace_words_in_a_text_string_us ing_str_replace.htm Unfortunatelly it does not work the way I want, because if I want to replace the word "in" all passages containing the characters "in" are replaced. For example Singapore.

You need to tokenize your input and do exact matching. Alternately, preg_match / preg_replace may work with \b to specify word boundries.

Hi Duncan, that in fact was the key and only way to get a proper result. I found this script on the preg_replace page of php.net: // Function highlights $words in $str function highlight_words($str, $words) { if(is_array($words)) { foreach($words as $k => $word) {

     $pattern[$k] = "/\b($word)\b/is";
     $replace[$k] = '<b>\\1</b>';

} } else { $pattern = "/\b($words)\b/is"; $replace = '<b>\\1</b>'; } return preg_replace($pattern,$replace,$str); } Which works excellent! Thanx, Merlin