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Allowing punctuation marks in regular expressions
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QAIX > PHP web-programming > Allowing punctuation marks in regular expressions 6 June 2003 02:42:22
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Allowing punctuation marks in regular expressions

Luis Lebron 6 June 2003 02:42:22
 I found the following function to test a string for alphanumeric characters

function is_alphanumeric($st­ring)
{
return (preg_match("/^[a-z0-9]+$/i­", $string));
}

How can I modify it so that it also allows punctuation marks?

thanks,

Luis R. Lebron
Add comment
Dan Joseph 5 June 2003 22:41:49 [ permanent link ]
 Hi,
return (preg_match("/^[a-z0-9]+$/i­", $string));

That a-z0-9 is where you can do it. Just add ! or . or ? to the end:

a-z0-9!?.

Also, if you want upper case letters, make sure you add A-Z:

A-Za-z0-9!?.

-Dan Joseph

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Add comment
Luis Lebron 5 June 2003 22:57:40 [ permanent link ]
 I tried adding a period to the end but a string will a period still returns
false

function is_alphanumeric($st­ring)
{
return (preg_match("/^[A-Za-z0-9.]+$/i­", $string));
}


-----Original Message-----
From: Dan Joseph [mailto:djoseph@duhq.us]
Sent: Thursday, June 05, 2003 2:42 PM
To: Php-General (E-mail)
Subject: RE: [PHP] Allowing punctuation marks in regular expressions


Hi,
return (preg_match("/^[a-z0-9]+$/i­", $string));

That a-z0-9 is where you can do it. Just add ! or . or ? to the
end:

a-z0-9!?.

Also, if you want upper case letters, make sure you add A-Z:

A-Za-z0-9!?.

-Dan Joseph

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To unsubscribe, visit: http://www.php.net/­unsub.php
Add comment
Leif K-Brooks 5 June 2003 23:04:22 [ permanent link ]
 It's using the case-insensitive switch.

Dan Joseph wrote:
Also, if you want upper case letters, make sure you add A-Z:


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Add comment
John W. Holmes 6 June 2003 02:42:22 [ permanent link ]
 
I tried adding a period to the end but a string will a period still> returns> false>
function is_alphanumeric($st­ring)> {> return (preg_match("/^[A-Za-z0-9.]+$/i­", $string));> }

No it doesn't. It's not allowing spaces, though... Is that the problem?

---John W. Holmes...

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QAIX > PHP web-programming > Allowing punctuation marks in regular expressions 6 June 2003 02:42:22
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