php基礎30：正則匹配-量詞

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<?php    //Regex        //1.第一個Regex    if("a"=="a"){        echo "equal";    }else{        echo "noequal";    }    echo "<hr>";    //第一個參數表示匹配模式，第二個參數匹配的字串    echo (preg_match(‘/php/‘,"php"));    echo (preg_match(‘/php/‘,"php222"));    echo (preg_match(‘/php/‘,"p2h2p2"));    $modle = "/php/";    $string = "php";    if (preg_match($modle, $string)) {        echo "success";    }else{        echo "fail";    };    echo "<hr>";    //什麼叫做匹配？：按照模式來匹配    //匹配與相等是不同的概念    //2.量詞+：匹配任何至少包括一個前置字串（1個或者多個）    // 前置：前面一個字元，+的前置是h    // h+ 的意思是只要要包括1個h    $model = "/ph+p/";    $string = "phhhhhhhp";    echo(preg_match($model, $string));//1    $model = "/ph+p/";    $string = "phhhgggggggggp";    echo(preg_match($model, $string));//0    $model = "/ph+p/";    $string = "pp";    echo(preg_match($model, $string))."<hr>";//0    // 3.量詞*：匹配任包括0個或者多個前置字串（0個或者多個）    // * 雖然可以是0個，但是前置字元不能更改，更就不匹配了    $model = "/ph*p/";    $string = "php";    echo(preg_match($model, $string));//1    $model = "/ph*p/";    $string = "pp";    echo(preg_match($model, $string));//1    $model = "/ph*p/";    $string = "pbbbbp";    echo(preg_match($model, $string));//0    echo "<hr>";    // 3.量詞?：匹配任何包含1個或者0個前置字元    $model = "/ph?p/";    $string = "pp";    echo(preg_match($model, $string));//1    $model = "/ph?p/";    $string = "php";    echo(preg_match($model, $string));//1    $model = "/ph?p/";    $string = "phhhp";    echo(preg_match($model, $string))."<hr>";//0    //4.量詞（.）匹配任意一個字元    //n個點匹配n個任一字元    $model = "/p.p/";    $string = "php";    echo(preg_match($model, $string));//1    $model = "/p..p/";    $string = "phrp";    echo(preg_match($model, $string));//1    $model = "/p..p/";    $string = "php";    echo(preg_match($model, $string));//0    $model = "/p..p/";    $string = "phhhp";    echo(preg_match($model, $string))."<hr>";//0    //5.(.與*)的配合    //（.*）表示任意前置字元，0個或者多個    $model = "/p.*p/";    $string = "php";    echo(preg_match($model, $string));//1    $model = "/p.*p/";    $string = "phhhhhhp";    echo(preg_match($model, $string));//1    $model = "/p.*p/";    $string = "pp";    echo(preg_match($model, $string))."<hr>";//1    // 6.量詞{x}：表示前置必須是3個    $model = "/ph{3}p/"; // h{3}匹配3個h    $string = "phhhp";    echo(preg_match($model, $string));//1    $model = "/ph{3}p/";    $string = "php";    echo(preg_match($model, $string))."<hr>";//0    //7.量詞{x,y}：匹配x-y個前置字串    $model = "/ph{3,5}p/";    $string = "phhhp";    echo(preg_match($model, $string));//1    $model = "/ph{3,5}p/";    $string = "phhhhp";    echo(preg_match($model, $string));//1    $model = "/ph{3,5}p/";    $string = "phhhhhp";    echo(preg_match($model, $string))."<hr>";//1    //8.量詞{x,}：匹配至少x個前置字串    $model = "/ph{3,}p/";    $string = "phhhp";    echo(preg_match($model, $string));//1    $model = "/ph{3,}p/";    $string = "phhp";    echo(preg_match($model, $string));//0    $model = "/ph{3,}p/";    $string = "phhhhp";    echo(preg_match($model, $string))."<hr>";//1    //9.$：匹配字串的行尾    //$一般載入字串的尾巴上，表示從尾巴開始匹配（以xxx結尾）    $model = "/php/";    $string = "cccccccccccccccc php ccccccccccc";    echo(preg_match($model, $string));//1    $model = "/php$/";    $string = "cccccccccccccccc php ccccccccccc";    echo(preg_match($model, $string));//0    $model = "/php$/";    $string = "cccccccccccccccccccccccccccphp";    echo(preg_match($model, $string))."<hr>";//1    //10. ^ 表示從頭開始匹配    // 表示 以 xxx 開始    $model = "/^php/";    $string = "cccccccccccccccccccccccccccphp";    echo(preg_match($model, $string));//0    $model = "/^php/";    $string = "phpcccccccccccccccccccccccccccphp";    echo(preg_match($model, $string));//1    //如果^和$一起使用，表示匹配一模一樣的，那就使用==即可    $model = "/^php$/";    $string = "phpcccccccccccccccccccccccccccphp";    echo(preg_match($model, $string))."<hr>";//1    // 10. | : 匹配字串的左邊或者右邊    //條件選擇符號    $model = "/php|jsp/";    $string = "php";    echo(preg_match($model, $string));//1    $model = "/php|jsp/";    $string = "jsp";    echo(preg_match($model, $string));//0    $model = "/php|jsp/";    $string = "asp";    echo(preg_match($model, $string));//0    $model = "/php|jsp|asp/";    $string = "asp";    echo(preg_match($model, $string))."<hr>";//1    // 11. () : 包圍一個字元分組或者    //講到後面才可以理解?>

 

php基礎30：正則匹配-量詞