Email+URL的判断和自动转换函数

  <?php

  function validateEmail($email)

  {     return eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email);

  }

  function validateURL($url)

  {     return eregi("^((ht|f)tp://)((([a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))|(([0-9]{1,3}\.){3}([0-9]{1,3})))((/|\?)[a-z0-9~#%&'_\+=:\?\.-]*)*)$", $url);

  }

  function convertURLS($text)

  {     $text = eregi_replace("((ht|f)tp://www\.|www\.)([a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})((/|\?)[a-z0-9~#%&\\/'_\+=:\?\.-]*)*)", "http://www.\\3", $text);

  $text = eregi_replace("((ht|f)tp://)((([a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))|(([0-9]{1,3}\.){3}([0-9]{1,3})))((/|\?)[a-z0-9~#%&'_\+=:\?\.-]*)*)", "<a href=\"\\0\">\\0</a>", $text);

  return $text;

  }

  function convertMail($text)

  {     $text = eregi_replace("([_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))", "<a href='mailto:\\0'>\\0</a>", $text);

  return $text;

  }

  function convertAllLinks($text)

  {     $text = convertURLS($text);

  $text = convertMail($text);

  return $text;

  }

  ?>