Username validation regex

[Mancunian]

I am looking for some help on fixing my "Username match Regular Expression".
I am currently using this:
^[a-zA-Z0-9]+$
This does not permit a space within the username.

However, I want to allow a single space within the username but not allow multiple spaces.
So
John Doe - should be valid - as should John F Doe - i.e. a space between each word.
but
John.......Doe is invalid as it has multiple intervening spaces - shown here as dots as I cannot enter white space.

Can anybody help a I am suffering from a brain freeze with regex.

 

[Jake Bunce]

I want to allow everything that Xenforo currently allows in username (spaces, special characters, etc.), but I want to exclude any foreign language characters other than Western European stuff like Á, È, Ö, etc. I also want to exclude any weird special characters (stuff that doesn't show up on a normal US English qwerty keyboard) so someone's username doesn't end up being something like this: ┻ (ノಠ益ಠ)ノ彡┻

I found this regex string online, but I don't think it's exactly what I need:

^[\-\.a-zA-Z0-9'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ\\ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ]*$

Any ideas?

I am not familiar with the entire range of accented latin characters, but that regex appears to explicitly name all of the allowed accented characters as well as the range of unaccented characters and numbers (a-z, 0-9). It also allows some punctuation (dash, period, single quote, backslash, but no spaces). That regex explicitly names what is allowed thereby excluding everything else.

That regex looks like what you need.

 

[Apt Irrelevance]

Awesome, thanks. I do want to allow spaces and underscores as well. Where would I add that?

 

[Jake Bunce]

Awesome, thanks. I do want to allow spaces and underscores as well. Where would I add that?

Just add them to the end, like so:

^[\-\.a-zA-Z0-9'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ\\ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ_ ]*$

 

[Apt Irrelevance]

Perfect!

 

[SoManyPosts]

How can I disallow anything that doesn't return true on:
http://www.minecraft.net/haspaid.jsp?user=

 

[Jake Bunce]

How can I disallow anything that doesn't return true on:
http://www.minecraft.net/haspaid.jsp?user=

That can't be done with a regex. An addon is required.

I think Alofoxx is doing what you are trying to do:

http://xenforo.com/community/threads/help-with-code.35518/

 

[rdn]

^[a-zA-Z0-9 ]+$

(This is different to what you originally had.)

What about allowing space, underscore and hyphen?

 

[Paul B]

^[a-zA-Z0-9 _-]+$

 

[EQnoble]

add them right before the closing of the bracket

 

[rdn]

^[a-zA-Z0-9 _-]+$

To need to escape like?
^[a-zA-Z0-9 _\-]+$

 

[rdn]

Or something like:
^[a-zA-Z0-9 \_\-]+$

It will work the same?

 

[EQnoble]

Or something like:
^[a-zA-Z0-9 \_\-]+$

It will work the same?

There is no actual need in this case to escape those (though the hyphen should be escaped, at the end of a range/character class like [a-z-] it is literal and usually wont cause you any problems)

 

[rdn]

^[a-zA-Z0-9 _-]+$

You are saying this is very fine to use @EQnoble or having it like this?
^[a-zA-Z0-9 _\-]+$

 

[EQnoble]

Yup but in this case both examples in your post above this one express the same thing basically.

 

[rdn]

OK, I will keep using this: ^[a-zA-Z0-9 _-]+$
Thanks!

 

[Robert9]

I think about a regex for usernames also, but it will make problems to stupid users; so i would like to have another solution like changing the name for my needs:

If someone enters "Andy King" i want the name to be "Andy-king".
Means: replace " " with "-"; lower all chars, ucase first.

Probably i need an addon doing this, but when?
Before testing if the name is ok and free to use?

 

[mcatze]

^[a-zA-Z0-9 ]+$

(This is different to what you originally had.)

This doesn't work with Xenforo 2. What is the different?

 

[Dynamic]

Bump. Also curious how to use ^[a-zA-Z0-9]+$ in xF2.

Cheers.

 

[Jeremy P]

It looks like deliminators and flags are required in XF2, so try /^[a-zA-Z0-9]+$/i.

 

[Dynamic]

Works like a charm. Thanks very much Jeremy