i have used the following code to validate the username it is working fine - if( $username == "" || !preg_match("/^[a-z0-9]+(?:_[a-z0-9]+)?$/i", $username) )
-
{
-
$error.="User name cannot be blank or has special characters";
-
}
-
it does not accept UNDERSCORE at the beginning or end however while i was testing with different special characters except for # the validation works fine for all other special characters.
for example if i enter the user name as = abc#123
in this case # sign and what comes after # sign is being ignored. so in this case the username is being read as abc ONLY and not abc#123
this is very strange, how can i still validate # sign and tell the user that # sign is not a valid username like i have been doing with any other special characters like = !@$...........
please advice.
thanks.
24  2972  Markus 6,050
Recognized Expert Expert
Cannot understand your problem?
What do you want your regex to accept and not accept?
Maybe we could help you create a new one.
hsriat 1,654
Recognized Expert Top Contributor
in this case # sign and what comes after # sign is being ignored. so in this case the username is being read as abc ONLY and not abc#123
Its not a problem with regexp.
It seems like you are submitting your username with ajax and not doing encodeURICompon ent() to it before submitting.
Atli 5,058
Recognized Expert Expert
Also, if you are submitting your usernames as GET variables, via the URL, the # character and anything that follows it will be parsed as an anchor name by the browser.
If that is the case, try the urlencode and urldecode functions.
hsriat 1,654
Recognized Expert Top Contributor
Also, if you are submitting your usernames as GET variables, via the URL, the # character and anything that follows it will be parsed as an anchor name by the browser.
If that is the case, try the urlencode and urldecode functions.
But I thought the browser in itself always does urlencoding of the from elements before sending them by GET method (except when using Ajax). Don't you think so?
Try this example...
[HTML]<html>
<form action="page_do esnt_exist.htm" >
<input name="param" value="">
<input type="submit" value="Check what's the url">
</form>
</html>[/HTML]
Just type in a value containing # in the field and click button to see what's the url. Isn't it already urlencoded?
I typed abc#xyz and got page_doesnt_exi st.htm?param=ab c%23xyz in the address bar when clicked on submit.
# got encoded to %23
Atli 5,058
Recognized Expert Expert
But I thought the browser in itself always does urlencoding of the from elements before sending them by GET method (except when using Ajax). Don't you think so?
True. If you submit an actual <form> the browser should take care of this for you.
I was thinking more along the lines of putting them manually in the URL string.
Like if you had made a list of users and wanted each name to link to another script, passing along the username in the URL.
Could have chosen my words more carefully in my previous post. Sorry about that.
Markus 6,050
Recognized Expert Expert
Where did you get the idea that this is to do with ajax or URLs?
Markus 6,050
Recognized Expert Expert
Oh, because # marks a placement in the page and what comes after that is looked for in a div id.
I see.
But why submit it through GET?
Makes more sense for POST, right?
hsriat 1,654
Recognized Expert Top Contributor
Where did you get the idea that this is to do with ajax or URLs?
Well, any variable (username in this case) can be posted by 4 ways (according to my knowledge).
1. Simple GET - # won't give any trouble as its already urlencoded by browser.
2. Simple POST - same here...
3. Ajax GET - # could cause a problem, as # in url is for anchors
4. Ajax Post - not sure about this one..
So I thought it could be case 3.
......because # marks a placement in the page and what comes after that is looked for in a div id.....
Sorry to disagree slightly here.
A destination anchor is not just, or only, a div. The destination anchors in HTML documents may be specified either by the A element (naming it with the name attribute), or by any other element (naming with the id attribute).
Ronald
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