Preg_match帮助从一个输入框 - preg_match help from an input box

preg_match help from an input box

本文关键字：一个输入 match 帮助 Preg | 更新日期: 2023-09-26

I need to validate a Date from an input box.

正则表达式很好，但仅此而已。首先，它在范围的什么地方，其次，你能帮助实现它吗?当它验证时，我不希望它回显任何东西，当它不回显时，我希望它回显任何东西告诉用户必须以mm/dd/yyyy格式输入。如果你能在警告框中做到这一点，那就更好了!谢谢各位开发者!!COMPLETE代码跟在标记后面。你会看到preg_match被注释掉了。谢谢各位开发者!!

$input = '<input value="Date" type="text" name="date">';
if (preg_match('/^(|(0[1-9])|(1[0-2]))'/((0… $input)) {
echo "";
} else {
echo "You must Re-enter date in mm/dd/yyyy format.";
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<embed src="Songs/nature.mp3" width=10 height=10 autostart=true repeat=true loop=true></embed>
    <title>Post Song</title>
    <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
</head>
<body>
    <h1>Post New Song</h1>
    <hr />
    <br />
    <body background="Songs/back.jpg">
    <form action= "Postsong.php" method="POST">
    <span style="font-weight:bold">Song:</span>
        <input value="" type="text" name="song" />
    <span style="font-weight:bold">Artist Name:</span>
        <input value="" type="text" name="name" />
    <span style="font-weight:bold">Date:</span>
        <input value="" type="text" name="date" /><br />
        <br />
        <br />
    <input type="submit" name="submit"
        value="Post Song" />
    </form>
    <hr />
    <p>
    <a href="working.php">View Songs</a>
    </p>

    <?php
/*
    $input = '<input value="Date" type="text" name="date">';
    if (preg_match('/^(|(0[1-9])|(1[0-2]))'/((0[1-9])|(1'd)|(2'd)|(3[0-1]))'/(('d{4}))$/', $input)) {
    echo "";
} else {
    echo "You must Re-enter date in mm/dd/yyyy format.";
}
*/
    if (isset($_POST['submit'])) {
        $Song = stripslashes($_POST['song']);
        $Name = stripslashes($_POST['name']);
        $Date = stripslashes($_POST['date']);
        $Song= str_replace("~", "-", $Song);
        $Name = str_replace("~", "-", $Name);
        $Date = str_replace("~", "-", $Date);
        $ExistingSubjects = array();
        if (file_exists(
            "Songs/songs.txt") &&
            filesize("Songs/songs.txt")
            > 0) {
            $SongArray = file(
                "Songs/songs.txt");
            $count = count($SongArray);
            for ($i = 0; $i < $count; ++$i) {
                $CurrSong = explode("~",
                    $SongArray[$i]);
                $ExistingSubjects[] = $CurrSong[0];
            }
        }
        if (in_array($Song, $ExistingSubjects)) {
            echo "<p>The song you entered
                already exists!<br />'n";
            echo "Please enter a new song and
                try again.<br />'n";                        // Do I need another if statement saying if empty echo you need to enter something?...
            echo "Your song was not saved.</p.";
            $Song = "";
        }
        else {
        $SongRecord =
            "$Song~$Name~$Date~'n";
        $SongFile = fopen(
            "Songs/songs.txt",
            "ab");
        if ($SongFile === FALSE)
            echo "There was an error saving your
                song!'n";
        else {
            fwrite($SongFile, 
                $SongRecord);
            fclose($SongFile);
            echo "Your song has been 
            saved.'n";
            $Song = "";
            $Name = "";
            $Date = "";
        }
    }
}
    else {
        $Song = "";
        $Name = "";
        $Date = "";
    }


    ?>
    </body>

以下正则表达式匹配mm/dd/yyyy

(0[1-9]|1[0-2])/(0[1-9]|1[0-9]|2[0-9]|3(0|1))/'d{4}

第一部分即(0[1-9]|1[0-2])检查从01到12的两位数字。

下一部分即(0[1-9]|1[0-9]|2[0-9]|3(0|1))检查从01到31的两个数字。

下一部分即'd{4}检查4位。

部件之间的/检查/作为分隔符