im trying to do a numeric textbox in asp.net using regex, and came up with:
^[^\s]+[/d]+[^\s]$
I want it to disallow leading/trailing whitespace, and allow only numbers.
Any clue why it doesnt work?
You can try this ^\d+$. \d matches digits. The one you wrote does not work because you are using /d instead of \d.
Since you want to disallow whitespace and other characters, why don't you try ^\d+$ and inverse the way of evaluation in your code?
Your regex currently means "anything but whitespace, followed by slashes and d-letters, followed by one more of anything but whitespace". A simple ^\d+$ is sufficient.
Related
I've a textbox in an ASP.NET application, for which I need to use a regular expression to validate the user input string. Requirements for regex are -
It should allow only one space between words. That is, total number of spaces between words or characters should only be one.
It should ignore leading and trailing spaces.
Matches:
Test
Test abc
Non Matches:
Test abc def
Test abc --> I wanted to include multiple spaces between the 2 words. However the editor ignores these extra spaces while posting a question.
Assuming there must be either one or two 'words' (i.e. sequences of non-space characters)
"\s*\S+(\s\S+)?\s*"
Change \S to [A-Za-z] if you want to allow only letters.
Pretty straightforward:
/^ *(\w+ ?)+ *$/
Fiddle: http://refiddle.com/gls
Maybe this one will do?
\s*\S+?\s?\S*\s*
Edit: Its a server-encoded regex, meaning that you might need to remove one of those escaping slashes.
How about:
^\s*(\w+\s)*\w+\s*$
I'm trying to create a RegEx Validator that checks the file extension in the FileUpload input against a list of allowed extensions (which are user specified). The following is as far as I have got, but I'm struggling with the syntax of the backward slash (\) that appears in the file path. Obviously the below is incorrect because it just escapes the (]) which causes an error. I would be really grateful for any help here. There seems to be a lot of examples out there, but none seem to work when I try them.
[a-zA-Z_-s0-9:\]+(.pdf|.PDF)$
To include a backslash in a character class, you need to use a specific escape sequence (\b):
[a-zA-Z_\s0-9:\b]+(\.pdf|\.PDF)$
Note that this might be a bit confusing, because outside of character classes, \b represents a word boundary. I also assumed, that -s was a typo and should have represented a white space. (otherwise it shouldn't compile, I think)
EDIT: You also need to escape the dots. Otherwise they will be meta character for any character but line breaks.
another EDIT: If you actually DO want to allow hyphens in filenames, you need to put the hyphen at the end of the character class. Like this:
[a-zA-Z_\s0-9:\b-]+(\.pdf|\.PDF)$
You probably want to use something like
[a-zA-Z_0-9\s:\\-]+\.[pP][dD][fF]$
which is same as
[\w\s:\\-]+\.[pP][dD][fF]$
because \w = [a-zA-Z0-9_]
Be sure character - to put as very first or very last item in the [...] list, otherwise it has special meaning for range or characters, such as a-z.
Also \ character has to be escaped by another slash, even inside of [...].
What is the Regular Expression Validator for only Letters and Numbers in asp.net?
I need to enter only 0-9,a-z and A-Z. I don't want to allow any special characters single or double quotes etc. I am using asp.net 3.5 framework.
I tried ^[a-zA-Z0-9]+$ and ^[a-zA-Z0-9]*$. They are not working.
Any help will be appreciated.
Try the following.
^[a-zA-Z0-9]+$
go to this example and also alphanumerics for more
then try this
^[a-zA-Z0-9]*$
If length restriction is necessary use
^[a-zA-Z0-9]{0,50}$
This will match alphanumeric strings of 0 to 50 chars.
you can try this....
^[a-zA-Z0-9]+$
see more info at here
You can define a regular expression as follows,
Regex myRegularExpression = new Regex(" \b^[a-zA-Z0-9]+$\b");
be sure to include System.Text.RegularExpression
and then use the Regex to match it with your user-control as follows,
eg : if your user-control is a textbox
myRegularExpression.isMatch(myTextBox.Text);
Dear English speaking people. With all due respect. A-Z are not the only letters in the world. Please use \w instead of [A-Za-z0-9] if you support other languages in your apps
I use asp.net and C#. I have TextBox with an Validation Control with RegEx.
I use this code as validation.
ValidationExpression="^(?s)(.){4,128}$"
But only in IE9 I receive an error: unexpected quantifier from the javascript section.
Probably I have to escape my RegEx but I do not have any idea how to do it and what to escape.
Could you help me with a sample of code? Thanks
Write it like this instead :
^([\s\S]){4,128}$
I suspect that (?s) is the cause of the error.
Three problems: (1) JavaScript doesn't support inline modifiers like (?s), (2) there's no other way to pass modifiers in an ASP validator, and (3) neither of those facts matters, because JavaScript doesn't support single-line mode. Most people use [\s\S] to match anything-including-newlines in JavaScript regexes.
EDIT: Here's how it would look in your case:
ValidationExpression="^[\s\S]{4,128}$"
[\s\S] is a character class that matches any whitespace character (\s) or any character that's not a whitespace character--in other words, any character. The dot (.) metacharacter matches any character except a newline. Most regex flavors (like .NET's) support a "Singleline" or "DOTALL" mode that makes the dot match newlines, too, but not JavaScript.
JavaScript doesn't understand (?s) afaik, instead you can replace . with [^] or [\s\S].
Eg: ^[^]{4,128}$
I'm looking for a regex that will allow Alpha Numeric and most all special characters except white space. It should be usable in c#. It would be nice if .net supported posix style but I can't seem to get it to work. TIA
Pretty sure \S (note capitalization) is the non-whitespace character class.
Something along the lines of: [^\s]+ should do the trick.
This roughly translates as "match one or more consecutive characters that are not whitespace" (\s matches a space, tab, or line break).