form validation in PHP with regex:
regular expressions are used to check patterns in our data.
Regular expressions commonly known as regex (regexes) are a sequence of characters describing a special search pattern in the form of the text string
/ /: are used in single quotes for regex
^:defines starts with
$: defines ending
.{minimum_limit,maximum_limit}:used to define length limit
<?php
$n_err=$eml_err=$ph_err=$pass_err=" ";
$n=$eml=$ph=$pass="";
if($_SERVER['REQUEST_METHOD']=="POST")
{
if(empty($_POST['uname']))
{
$n_err="fill your name";
}
else
{
$n=correct($_POST['uname']);
if(!preg_match('/^[a-zA-Z ]{2,30}+$/',$n))
{
$n_err="only letters are allowed";
}
else
{
$n_err="";
}
}
if(empty($_POST['uemail']))
{
$eml_err="fill your email";
}
else
{
$eml=correct($_POST['uemail']);
if(!filter_var($eml,FILTER_VALIDATE_EMAIL))
{
$eml_err="INVALID EMAIL";
}
else
{
$$eml_err="";
}
}
if(empty($_POST['ugender']))
{
$g_err="please select any gender";
}
else
{
$g_err="";
$g=correct($_POST['ugender']);
}
if (empty($_POST['uphone']))
{
$ph_err="fill ypur phone number";
}
else
{
$ph=correct($_POST['uphone']);
if(!preg_match('/^[6-9][0-9]{9}+$/',$ph))
{
$ph_err="phone is invalid";
}
else
{
$ph_err="";
}
}
if (empty($_POST['upass']))
{
$pass_err="fill ypur phone number";
}
else
{
$pass=correct($_POST['upass']);
if(!preg_match('/^(?=.*?[0-9])(?=.*?[A-Z ])(?=.*?[!@#$%^&*-]).{8,}$/',$pass))
{
$pass_err="password is invalid";
}
else
{
$pass_err="";
}
}
}
function correct($data)
{
$data=trim($data);
$data=stripslashes($data);
$data=htmlspecialchars($data);
return $data;
}
?>
<form method="poSt" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text" name="uname"><span><?php echo $n_err; ?></span>
<br><br>
E-mail: <input type="text" name="uemail"><span><?php echo $eml_err; ?></span>
<br><br>
phone: <input type="text" name="uphone"><span><?php echo $ph_err; ?></span>
<br><br>
password: <input type="text" name="upass"><span><?php echo $pass_err; ?></span>
<br><br>
Gender:
<input type="radio" name="ugender" value="female">Female
<input type="radio" name="ugender" value="male">Male
<input type="radio" name="ugender" value="other">Other
<?php echo $g_err; ?></span>
<br><br>
<input type="submit" name="save" value="Submit">
</form>
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