[SOLVED] only letters and numbers min. 8 max. 12 characters

[dadamssg]

im tryin to write a pattern that must have 8 to 12 characters in it, and can only be letters or numbers, would i be close with something like this?

 

ereg("^[A-Za-z]{8,9,10,11,12}$")

 

i don't think i did the {} part right though

 

i see an example of a patter, not really sure what it checks for but here it is

 

ereg("^[A-Za-z' -]{1,50}$")

 

im basing mine kind of off this

[rhodesa]

not sure about ereg, but for preg it would be:

if(preg_match('/^[a-z0-9]{8,12}$/i',$string)){

}

[dadamssg]

thank you thank you, what does the i mean?

[rhodesa]

case insensitive...so it will allow a-z and A-Z...you could also write it as:

preg_match('/^[a-zA-Z0-9]{8,12}$/',$string)

...i just prefer the other way

[dadamssg]

sweet thanks

[dadamssg]

this isn't working...it will always say whatever the username is, isn't a valid one.

if(!preg_match('/^[a-z0-9]{8,12}$/i',$_POST['username']))
{
$messages="{$_POST['username']} is not a valid username.";
}

[dadamssg]

i got it working...using this

 

if(!eregi("^[A-Za-z' -]{8,14}$",$_POST['username']))
{
$messages="Username must be only letters or numbers and have at least eight characters.";
}

[.josh]

that eregi matches letters, a single quote, a space or a dash. no numbers.  It also matches up to 14 chars.  Also, you don't want to use eregi, because it will no longer be part of the core in php6, because the posix functions (eregxxx) suck compared to the pcre functions (pregxxx)

 

If the preg_match one didn't work for you, try trimming the posted var first.