Regular Experssion

Jeg har et forum, hvor det er muligt at bruge smileys. Jeg bruger regular expression til at søge efter f.eks. :-) og så erstatte det med et billede. Mit problem er, at i et tilfælde bliver ") det samme som ;).

Her er koden:
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$patterns[0] = "/:\)/";
    $patterns[1] = "/;\)/";
    $patterns[2] = "/:D/";
    $patterns[3] = "/:\(/";
    $patterns[4] = "/:P/";
    $patterns[5] = "/:-\)/";
    $patterns[6] = "/;-\)/";
    $patterns[7] = "/:-D/";
    $patterns[8] = "/:-\(/";
    $patterns[9] = "/:-P/";
    $patterns[10] = "/:-p/";
    $patterns[11] = "/:sådan/";
    $patterns[12] = "/:lort/";
    $patterns[13] = "/:hvadskerderher/";
    $patterns[14] = "/:solbriller/";
    $patterns[15] = "/:bræk/";
    $replacements[0] = "<img src=\"smiley/smile.gif\" alt='Smiley' />";
    $replacements[1] = "<img src=\"smiley/wink.gif\" alt='Smiley' />";
    $replacements[2] = "<img src=\"smiley/biggrin.gif\" alt='Smiley' />";
    $replacements[3] = "<img src=\"smiley/sad.gif\" alt='Smiley' />";
    $replacements[4] = "<img src=\"smiley/tongue.gif\" alt='Smiley' />";
    $replacements[5] = "<img src=\"smiley/smile.gif\" alt='Smiley' />";
    $replacements[6] = "<img src=\"smiley/wink.gif\" alt='Smiley' />";
    $replacements[7] = "<img src=\"smiley/biggrin.gif\" alt='Smiley' />";
    $replacements[8] = "<img src=\"smiley/sad.gif\" alt='Smiley' />";
    $replacements[9] = "<img src=\"smiley/tongue.gif\" alt='Smiley' />";
    $replacements[10] = "<img src=\"smiley/tongue.gif\" alt='Smiley' />";
    $replacements[11] = "<img src=\"smiley/up.gif\" alt='Smiley' />";
    $replacements[12] = "<img src=\"smiley/down.gif\" alt='Smiley' />";
    $replacements[13] = "<img src=\"smiley/eek.gif\" alt='Smiley' />";
    $replacements[14] = "<img src=\"smiley/sun.gif\" alt='Smiley' />";
    $replacements[15] = "<img src=\"smiley/puke.gif\" alt='Smiley' />";
    $bodytext = preg_replace($patterns, $replacements, $data['bodytext']);