Simple Regular Expressions using preg_match()

Enter a string to be evaluated.

Text:

String

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CODE FOLLOWS

<?php
include('includes/header.php');

error_reporting(E_ALL);    // set error reporting to all

$self = basename($_SERVER['SCRIPT_NAME']);
$step = isset($_POST['step']) ? $_POST['step'] : 1;
$string = isset($_POST['string']) ? $_POST['string'] : null;

if ($step == 1) // first time into this script
{
    ?>

    <h1>
        Simple Regular Expressions using preg_match()
    </h1>

    <p>
        Enter a string to be evaluated.
    </p>

    <form action="<?php echo($self); ?>" method="POST">

        <fieldset>
            <legend>Text:</legend>
            <label for="string">String</label>
            <input type="text" size="30" id="string" name="string" value="<?php echo($string); ?>">
        </fieldset>

        <input type="hidden" name="step" value="2">
        <input type="submit" name="submit" value="Submit">
    </form>

    <?php
}  // end of step 1


if ($step == 2) // second time into this script
{
    // show results and provide a form to try again

    // define arrays for search

    $a = array();
    $b = array();
    $c = array();
    $d = array();
    $e = array();
    $f = array();


    // Note the preg_match pattern used to evaluate the string provided.

    $aa = preg_match("/[A-z]/", $string, $a);
    $bb = preg_match("/[A-Z]/", $string, $b);
    $cc = preg_match("/[a-z]/", $string, $c);
    $dd = preg_match("/[A-a]/", $string, $d);
    $ee = preg_match("/tedd/", $string, $e);
    $ff = preg_match("/world/", $string, $f);

    ?>

    <h3> String Provided: <?php echo($string); ?></h3>

    <p>
        1. preg_match("/[A-z]/", <?php echo($string); ?>); = <?php if ($aa) {
            print_r($a[0]);
        } ?><br>
        2. preg_match("/[A-Z]/", <?php echo($string); ?>); = <?php if ($bb) {
            print_r($b[0]);
        } ?><br>
        3. preg_match("/[a-z]/", <?php echo($string); ?>); = <?php if ($cc) {
            print_r($c[0]);
        } ?><br>
        4. preg_match("/[A-a]/", <?php echo($string); ?>); =<?php if ($dd) {
            print_r($d[0]);
        } ?><br>
        5. preg_match("/tedd/", <?php echo($string); ?>); = <?php if ($ee) {
            print_r($e[0]);
        } ?><br>
        6. preg_match("/world/", <?php echo($string); ?>); = <?php if ($ff) {
            print_r($f[0]);
        } ?><br>
    </p>

    <p>
        Remember, these are the results of different preg_match() operations. <br>
        Try different strings to see how different expressions work.
    </p>

    <p>
        <a href="http://php.net/manual/en/function.preg-match.php">See the PHP manual</a>
    </p>

    <form action="<?php echo($self); ?>" method="POST">
        <p>
            <input type="hidden" name="step" value="1">
            <input type="submit" name="submit" value="Try Again">
        </p>
    </form>

    <?php
}    // end of step 2

include('includes/footer.php');
?>


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