regex - php regular expression...weird behavior -

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what's wrong in expression? 

echo preg_replace("/condizioni/","ciao","<tr bla vla condizioni");

it not return anything...

anyway works when remove "<" char...but don't understand why...is special char, , if i have match literally.

thank you...

it work want (code on ideone). thing echo "<tr bla vla ciao"; in web page cause troubles. have escape html chars.

htmlspecialchars() :

echo htmlspecialchars(preg_replace("/condizioni/","ciao","<tr bla vla condizioni"));

it echo &lt;tr bla vla ciao.


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