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$source = "My email address is ck@qsok.com";
if (ereg("email", $source)) {
  echo "the source has 'email' on the content";
}

$source = "My email address is ck@qsok.com";
if (preg("/email/", $source)) {
  echo "the source has 'email' on the content";
}

$source = "My email address is ck@qsok.com";
if (eregi("chun kang", $source)) {
  echo "the source has 'chun kang' on the content";
}

$source = "My email address is ck@qsok.com";
if (preg_match("/Chun Kang/i", $source)) {
  echo "the source has 'email' on the content";
}