Reg Exp Help plz

[gvanto]

I would like an input text field to only allow the following:

• Letters and numbers (alphanumerics)
• The '&' character

The following code will meet the first condition but not the second can I cant seem to get it to work 🙁

if (!ereg("^[[:space:][:alnum:]]+$", $txfTrack))
{
        $errMsg .= "Please use only letters and numbers in 'track' field<br>";
} 

any help much appreciated,
Gerry
reg-exp newbie

[dougal85]

Try this:

if (!ereg("^[[:space:][:alnum:]&]+$", $txfTrack))
{
        $errMsg .= "Please use only letters and numbers in 'track' field<br>";
}

I've not worked regular expression in a long time. I think all you needed to do was add it in the squared brackets next to "[:space:][:alnum:]"

oh and btw... I can only assume that [:space:] allows spaces to be in the string aswell, I'm not sure if you want that?

If you want more info on regular expressions i'd look at this website...

http://weblogtoolscollection.com/regex/regex.php

Hope that helps?

[NogDog]

PREG solution:

// true if any character found that is not: a-zA-Z | 0-9 | white-space | &
if(preg_match('/[^a-z\d\s&]/i', $txfTrack) 
{
   $errMsg .= "Please use only letters and numbers in 'track' field<br>";
}

[dougal85]

// true if any character found that is not: a-zA-Z | 0-9 | white-space | &
if(preg_match('/[^a-z\d\s&]/i', $txfTrack))
{
   $errMsg .= "Please use only letters and numbers in 'track' field<br>";
}

you missed a bracket on the if statement. this one works 🙂

[NogDog]

dougal85 wrote:

you missed a bracket on the if statement. this one works 🙂

Ah, yes: probably my most common syntax error. :rolleyes:

[gvanto]

Thanks a million guys - you are champions! 😃

gerry