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December 3, 2013 11:47
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preg_match() in PHP
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| <!Doctype html> | |
| <html> | |
| <head> | |
| <title>preg_match() in PHP<title> | |
| </head> | |
| <body> | |
| <!-- | |
| The preg_match() function searches a string for pattern, returning true if the pattern exists, and false otherwise. | |
| PHP - Validate Name | |
| The code below shows a simple way to check if the name field only contains letters and whitespace. If the value of the name field is not valid, then store an error message: | |
| !--> | |
| <?php | |
| $name = test_input($_POST["name"]); | |
| if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
| { | |
| $nameErr = "Only letters and white space allowed"; | |
| } | |
| ?> | |
| <!-- | |
| PHP - Validate E-mail | |
| The code below shows a simple way to check if an e-mail address syntax is valid. If the e-mail address syntax is not valid, then store an error message: | |
| !--> | |
| <?php | |
| $email = test_input($_POST["email"]); | |
| if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
| { | |
| $emailErr = "Invalid email format"; | |
| } | |
| ?> | |
| <!-- | |
| PHP - Validate URL | |
| The code below shows a way to check if a URL address syntax is valid (this regular expression also allows dashes in the URL). If the URL address syntax is not valid, then store an error message: | |
| !--> | |
| <?php | |
| $website = test_input($_POST["website"]); | |
| if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
| { | |
| $websiteErr = "Invalid URL"; | |
| } | |
| ?> | |
| <!-- | |
| PHP - Validate Name, E-mail, and URL | |
| Now, the script looks like this: | |
| !--> | |
| <?php | |
| // define variables and set to empty values | |
| $nameErr = $emailErr = $genderErr = $websiteErr = ""; | |
| $name = $email = $gender = $comment = $website = ""; | |
| if ($_SERVER["REQUEST_METHOD"] == "POST") | |
| { | |
| if (empty($_POST["name"])) | |
| {$nameErr = "Name is required";} | |
| else | |
| { | |
| $name = test_input($_POST["name"]); | |
| // check if name only contains letters and whitespace | |
| if (!preg_match("/^[a-zA-Z ]*$/",$name)) | |
| { | |
| $nameErr = "Only letters and white space allowed"; | |
| } | |
| } | |
| if (empty($_POST["email"])) | |
| {$emailErr = "Email is required";} | |
| else | |
| { | |
| $email = test_input($_POST["email"]); | |
| // check if e-mail address syntax is valid | |
| if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email)) | |
| { | |
| $emailErr = "Invalid email format"; | |
| } | |
| } | |
| if (empty($_POST["website"])) | |
| {$website = "";} | |
| else | |
| { | |
| $website = test_input($_POST["website"]); | |
| // check if URL address syntax is valid (this regular expression also allows dashes in the URL) | |
| if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website)) | |
| { | |
| $websiteErr = "Invalid URL"; | |
| } | |
| } | |
| if (empty($_POST["comment"])) | |
| {$comment = "";} | |
| else | |
| {$comment = test_input($_POST["comment"]);} | |
| if (empty($_POST["gender"])) | |
| {$genderErr = "Gender is required";} | |
| else | |
| {$gender = test_input($_POST["gender"]);} | |
| } | |
| ?> | |
| </body> | |
| </html> |
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