User Name Match Regular Expression broken?

[User]

I have read the following threads:
[Suggestion] Disable/Enable Special Characters in Username
User Name Match Regular Expression
Disallow username spaces
Regex for usernames in registeration form.

As far as I can tell none of the suggestions worked, here is what the most promising one looks like:

The result is the same whether the regex has a preceeding / or not.
Is it busted?

All I want to do is only allow user names that have letters and/or numbers and no more than a single space in them.

 

[Mike]

You just write the regex part itself, not the delimiters. So you'd just do:

^[a-z0-9\s]+$

 

[User]

You just write the regex part itself, not the delimiters. So you'd just do:

^[a-z0-9\s]+$

Thanks. Is the \s an issue since it would match not just space but also whitespace like a tab?
It also seems like XF "autocorrects" multiple consecutive spaces into a single space?

Us    er becomes Us er

This is desired, just confirming that XF actually does that automagically.

 

[Mike]

It also seems like XF "autocorrects" multiple consecutive spaces into a single space?

Correct. You could just use a literal space as well. Technically speaking, that regex doesn't allow just one space in the name (in total), if that's what you were specifically after.

For one space in total, I think you'd have to use this (untested):

^[a-z0-9]+( [a-z0-9]+)?$

 

[User]

This seems to work, though perhaps unnecessarily strict since it will match single character user names which most board probably won't allow:

^[a-z0-9]++(?:\s[a-z0-9]++)?$

What this does is only allow latin letters, numbers, and a single space in the user name. Meaning that users can't have a phase as their user name.

"My Username" will work.
"My awesome Username" will not work since more than one space in name.

 

[Stuart Wright]

You just write the regex part itself, not the delimiters. So you'd just do:

^[a-z0-9\s]+$

I used that. I assume it allows alphanumeric plus spaces. It blocked

Mr Grimsdale2

with

1. Please enter another name. The entered value does not match the required format.

Why?

 

[Jeremy]

I was able to register that name using that RegEx on my test board. Are you sure you don't have any other characters within your validation field?

 

[Stuart Wright]

Doh there was a space on the end. Thanks Jeremy

 

[leemy]

Sorry I have no experience with regex.

I want to allow alphanumeric (uppercase, lowercase, numbers), additionally space, hyphen, and underscore.

is this it? ^[a-z0-9\s]+$

Do I need the \s? What is +$?

This page has a-z and A-Z
[url]http://xenforo.com/community/threads/username-validation-regex.24291/[/URL]
^[a-zA-Z0-9 ]+$
Actually @Mike is on both threads I'd appreciate your input!

 

[Paul B]

^[A-Za-z0-9 -_]+$

^ is an anchor and matches the beginning of the string
[] matches a single character contained within the brackets
+ repeats the previous match one or more times
$ is an anchor and matches the end of the string

So the above expression matches any uppercase or lowercase character from a to z, the digits 0 to 9 as well as space, hyphen and underscore, one or more times.

(\s matches any whitespace and is not needed)


My name is Brogan and I know (some) RegEx

 

[Jeremy]

Brogan is growing up and learning RegEx.

XenForo actually uses the caseless flag, so a-z actually matches the same thing as A-Za-z.