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PHP学习之路六（php与正则表达式）

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Jun 23, 2016 pm 02:29 PM

<html>	<head> 		<title>正则表达式和样式匹配</title>	</head>	<body>		<?php 			$find="love";//定义要查找的变量			$result=preg_match("/$find/","I love you,xiaohei!");//第一个参数为要查找																//变量，第二个参数为查找字符串			//查找 前后带空格的"you"，返回false			@$result1=preg_match("\byou\b/","I love you,xiaohei!");			if ($result){				echo "匹配成功！<br>";			}else {				echo "匹配失败！<br>";			}						if ($result1){				echo "\byou\b/"."匹配成功！<br>";			}else {				echo "\byou\b/"."匹配失败！<br>";			}				?>			<?php 	/*  ^元字符被称为行首端位。。匹配字符串起始找到的样式。	 *  判断获奖名单（"李兴乐 王长超 小黑"）中是否有王长超，在判断，王长超，李兴乐是否为第一个	 * */	$string="李兴乐 王长超 小黑";	$name1="王长超";	$name2="李兴乐";	if (ereg("王长超",$string)){//判断是否 有王长超		echo "有王长超！<br>";	}	if(ereg("^李兴乐",$string)){//判断行首是否为李兴乐		echo '李兴乐为第一个<br>';	}	 if(ereg("^王长超",$string)){		echo "王长超为第一个<br>";	}	if(ereg("小黑$",$string)){  //判断行尾 是否为 小黑		echo "小黑为最后一个<br>";	}		?>		<?php 		//邮箱格式判断		//元字符+ 用来匹配前面的子表达式 一次或多次..{2}表示匹配的次数喂两次。{2,4}重复 2-4次		$myemail="lixingle123@qq.com";		if (ereg("([0-9a-zA-Z]+)([@])([0-9a-zA-Z]+)([.])([0-9a-zA-Z]{2,4})",$myemail)){			echo $myemail."格式正确<br>";		}else {			echo  $myemail."格式不正确，请重新输入！<br>";		}	?>	<?php 	//匹配字符格式    //判断日期格式是否为 YYYY-MM-DD格式	   $mydate="2012-11-26";	   if (ereg("([0-9]{4})(-)([0-9]{2})(-)([0-9]{2})",$mydate,$regs)){	   		   	echo $regs[1]."年$regs[3]月$regs[5]日<br>";   	   }else {	   	echo "时间格式错误！<br>";	   }	   	   	   	   	?>	<?php 	/*PHP支持Perl样式的正则表达式，	 * 样式匹配函数：	 * int preg_match(string $pattern,string $subject[,array $matches[,int flages]]);	 * int preg_match_all(string $pattern,string $subject[,array $matches[,int flages]]);	 * preg_match()和preg_match_all()用法相似，但后者是匹配整个字符串，而不是执照第一个，并且返回找到的样式数量	 * 	 * */			$string ="I am studing PHP,PHP is so easy.PHP";		$result=preg_match_all("/PHP/i",$string,$matches,PREG_OFFSET_CAPTURE);			if ($result==true){			echo "$result PHP was found.<br>";			print_r($matches);			echo "<br>";						}else {			echo "PHP was not found.<br>";			print_r($matches);			echo "<br>";		}	?>			</body></html>

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