Question

我需要验证albumID输入是2个大写字母和3个数字。我使用http://regexr.com/和http://www.tutorialspoint.com/php/php_preg_match.htm来确认此

        <?php
         // define variables and set to empty values
          $albumidErr =  $albumid = "";
        if ($_SERVER["REQUEST_METHOD"] == "POST") {
           if (preg_match('/([A-Z]{2}[0-9]{3})/', $albumid))
            {
            $albumid = test_input($_POST["albumid"]);
            $albumidErr = print $albumid;
            }
           else { 
            $albumidErr = " Album ID must be 2 Uppercase letters and 3 numbers (i.e. BI010)";
            }

         }
        ?>
      <form method="post" action="
       <?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
        <p>
            <label for="albumid">*Album ID:</label>
            <?php echo $albumidErr;?><br>
            <input type="text" name="albumid" id="albumid"/>
        </p>

        <p>
            <input type="submit" name="submit" id="submit" value="submit"/>
        </p>
    </form>

应该有用，但不是：

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIScrollViewDelegate {

var imageView = UIImageView()

@IBOutlet var camera: UIButton!

@IBOutlet weak var photoLibrary: UIButton!

@IBOutlet weak var scrollView: UIScrollView!

@IBOutlet var imageDisplay: UIImageView!

@IBAction func photoLibraryAction(sender: AnyObject) {

    let picker = UIImagePickerController()
     picker.delegate = self
    picker.sourceType = .PhotoLibrary

    presentViewController(picker, animated: true, completion: nil)

}


@IBAction func cameraAction(sender: AnyObject) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .Camera

    presentViewController(picker, animated: true, completion: nil)

}


func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    imageDisplay.image = info[UIImagePickerControllerOriginalImage] as? UIImage; dismissViewControllerAnimated(true, completion: nil)

}

override func viewDidLoad() {
    super.viewDidLoad()
    scrollView.delegate = self

    imageView.frame = CGRectMake(0, 0, scrollView.frame.size.width, scrollView.frame.size.height)
    imageView.image = UIImage(named: "image")
    imageView.userInteractionEnabled = true

    scrollView.addSubview(imageView)

    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.loadImage(_:)))
    tapGestureRecognizer.numberOfTapsRequired = 1
    imageView.addGestureRecognizer(tapGestureRecognizer)

}

func loadImage (recognizer:UITapGestureRecognizer){
    let imagePicker = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary

    self.presentViewController(imagePicker, animated: true, completion: nil)

}


func imagePickController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage

    imageView.image = image
    imageView.contentMode = UIViewContentMode.Center
    imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height)

    scrollView.contentSize = image.size

    let scrollViewFrame = scrollView.frame
    let scaleWidth = scrollViewFrame.size.width / scrollView.contentSize.width
    let scaleHeight = scrollViewFrame.size.height / scrollView.contentSize.height
    let minScale = min(scaleHeight, scaleWidth)

    scrollView.minimumZoomScale = minScale
    scrollView.maximumZoomScale = 1
    scrollView.zoomScale = minScale

    centerScrollViewContents()

    picker.dismissViewControllerAnimated(true, completion: nil)

}

func centerScrollViewContents(){
    let boundsSize = scrollView.bounds.size
    var contentsFrame = imageView.frame

    if contentsFrame.size.width < boundsSize.width{
        contentsFrame.origin.x = (boundsSize.width - contentsFrame.size.width) / 2
    }else{
        contentsFrame.origin.x = 0
    }

    if contentsFrame.size.height < boundsSize.height {

        contentsFrame.origin.y = (boundsSize.height - contentsFrame.size.height) / 2
    }else{
        contentsFrame.origin.y = 0
    }

    imageView.frame = contentsFrame

}

func scrollViewDidZoom(scrollView: UIScrollView) {
    centerScrollViewContents()
}

func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
    return imageView
}

    // Do any additional setup after loading the view, typically from a nib.
}

func didReceiveMemoryWarning() {

    // Dispose of any resources that can be recreated.
}

Answer 1

在您的代码中：

$albumidErr =  $albumid = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (preg_match('/([A-Z]{2}[0-9]{3})/', $albumid))

您正在使$albumid为空，然后您尝试将正则表达式与此空字符串匹配，当然，它并不匹配。

我想你想要：

$albumidErr =  $albumid = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (preg_match('/([A-Z]{2}[0-9]{3})/', $_POST["albumid"]))
    //                                     ^^^^^^^^^^^^^^^^^

你可以添加锚点：

$albumidErr =  $albumid = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (preg_match('/^([A-Z]{2}[0-9]{3})$/', $_POST["albumid"]))

regex preg_match无法匹配大写字母和数字albumID

1 个答案: