PHP学习之路六（php与正则表达式）
<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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