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Validate String (Regular Expression)

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Nov 03.2013

I working on the form where i want to restrict the user to input only characters,digit, . , and white space. i want to validate 2 text field and one text area.

[code=html]if(!preg_match(“/^[a-zA-Z0-9].*$/”,$field1))
{
$turnmsg = “<b><font color=’red’> Only letters,spaces & . are allowed </font></b>”;
}

if(!preg_match(“/^[a-z A-Z].*$/”,$field2))
{
$turnmsg = “<b><font color=’red’> Only letters,spaces & . are allowed </font></b>”;
}

if(!preg_match(“/^[a-z A-Z].*$/”,$textarea1))
{
$turnmsg = “<b><font color=’red’> Only letters,spaces & . are allowed </font></b>”;
}[/code]

The problem is that when i applied preg_match on single field with if condition its working fine , but with the mutiple if condition its fail. any alternatives or do i needs any modificaiton into my code.

Thanks ,

Ashish

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PHP

6 Comments(s) ↴

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@bionoidNov 03.2013 — Modified your expression a little, and seeing that you require it on all three fields I'm appending them together:

$turnmsg = '';

if (!preg_match('[COLOR="#FF0000"]/^[a-zA-Zds.]*$/[/COLOR]', $field1 . $field2 . $textarea1))
{
$turnmsg = "&lt;b&gt;&lt;font color='red'&gt; Only letters,spaces &amp; . are allowed &lt;/font&gt;&lt;/b&gt;";
}

echo $turnmsg;
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@Ashish_SoodauthorNov 04.2013 — Its not working still i can able to enter special characters into my database(%,$#@ etc)
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@bionoidNov 04.2013 — Not that I could really see anything wrong with the previous expression, I've changed it a little again anyway.

Also how do you determine a validation error, or if you need to write to the database?

&lt;?php

$field1 = 'abc.123 ' . "nrt";
$field2 = '';
$textarea1 = '%$#@';

$turnmsg = '';

if (preg_match('[COLOR="#FF0000"]/[^a-zA-Zds.]/[/COLOR]', $field1 . $field2 . $textarea1)) {
$turnmsg = "&lt;b&gt;&lt;font color='red'&gt; Only letters,spaces &amp; . are allowed &lt;/font&gt;&lt;/b&gt;";
} else {

<i> </i>[COLOR="#FF0000"]//WRITE TO DATABASE?[/COLOR]

}

echo $turnmsg;

?&gt;

The current example outputs:

[COLOR="#FF0000"][B]Only letters,spaces &amp; . are allowed[/B][/COLOR]
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@Ashish_SoodauthorNov 04.2013 — Thanks for your reply, its working for me now.
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@Ashish_SoodauthorNov 04.2013 — @ bionoid

One more question can i use [B]htmlspecialchars [/B]or [B]htmlentities [/B]so i can avoid my form from hackers

if yes then could you please give me an example by taking my above code

Thanks again
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@Ashish_SoodauthorNov 04.2013 — Is this right way to used htmlspecialchars function

[B]$field1= htmlspecialchars($_POST['field1']);[/B] ?
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