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@NogDogNov 06.2008 — #
Actually, within a bracketed character class, the "." has no special meaning.
[indent]"All non-alphanumeric characters other than , -, ^ (at the start) and the terminating ] are non-special in character classes, but it does no harm if they are escaped." (fromhttp://php.net/manual/en/regexp.reference.php )[/indent]@NogDogNov 06.2008 — #
Your if condition is true if the string only contains valid characters, so you want to either negate it or compare it to FALSE:
bad REGEX pattern
Hi im trying to get my regular expression to work, im pants at it and when i look at the patterns my brain melts ?
I want my regEX to only accept alpha numberical characters underscores [COLOR=”Red”]–[COLOR=”red”].
check here [url]http://www.liquidfists.com/index2.php?page=signup
[code=php]
//CHECK USERNAME AND PASSWORD FOR VALID CHARICTERS
if (preg_match(‘/^[w.-]+$/’, $user_name) {
$login_warn_msg=’You have entered invalid characters in the username field.’;
$login_warn='<p class=”warning”>’.$login_warn_msg.'</p>’.”n”;
$login_warn.=$login_form;
echo $login_warn;
exit();
}
for example if i try and register the username testperson it says that i have invalid characters even though i dont because they all match alpha numberical characters underscores [COLOR=”Red”]–[COLOR=”red”].
anyhelp would be greatly appreciated.
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@NogDogNov 06.2008 — #The . character has special meaning within character classes.
http://www.regular-expressions.info/dot.html
Your expression as it is will match pretty much anything. Escape the dot and you should be in good shape.
preg_match('/^[w. -]+$/', $user_name)[/QUOTE]
Actually, within a bracketed character class, the "." has no special meaning.
[indent]"All non-alphanumeric characters other than , -, ^ (at the start) and the terminating ] are non-special in character classes, but it does no harm if they are escaped." (from
0
@NogDogNov 06.2008 — #Hi im trying to get my regular expression to work, im pants at it and when i look at the patterns my brain melts ?
I want my regEX to only accept alpha numberical characters underscores[COLOR="Red"]-[/COLOR] and[COLOR="red"].[/COLOR] characters and if it doesnt to warn them this should work from what i can see but its not working
check herehttp://www.liquidfists.com/index2.php?page=signup and it not achieving the desired results.
[code=php]
//CHECK USERNAME AND PASSWORD FOR VALID CHARICTERS
if (preg_match('/^[w.-]+$/', $user_name) {
$login_warn_msg='You have entered invalid characters in the username field.';
$login_warn='<p class="warning">'.$login_warn_msg.'</p>'."n";
$login_warn.=$login_form;
echo $login_warn;
exit();
}
[/code]
for example if i try and register the username testperson it says that i have invalid characters even though i dont because they all match alpha numberical characters underscores[COLOR="Red"]-[/COLOR] and[COLOR="red"].[/COLOR] characters
anyhelp would be greatly appreciated.[/QUOTE]
Your if condition is true if the string only contains valid characters, so you want to either negate it or compare it to FALSE:
[code=php]
if( ! preg_match(...)) {
// ...or... //
if(preg_match(...) == false) {
[/code]