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<?php
if (ereg("c","abcdef")){     //˵Ã÷£ºÅжÏabcdefÖÐÊÇ·ñº¬ÓÐ×Öĸc
     echo "ͨ¹ý";
}else{
     echo "´íÎó";
}
?>
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<?php
if (ereg("^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3}$",$email)) {
   echo "ÄúµÄ E-Mail ͨ¹ý³õ²½¼ì²é";
}
?>
eregi()
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<?php
if (ereg("C","abcdef")){
     echo "ͨ¹ý";
}else{
     echo "´íÎó";
}
?>
//·µ»Ø½á¹ûÊÇ£º´íÎó
<?php
if (eregi("C","abcdef")){
     echo "ͨ¹ý";
}else{
     echo "´íÎó";
}
?>
//·µ»Ø½á¹ûÊÇ£ºÍ¨¹ý
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