how to write RegularExpressionValidator

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how do i write RegularExpressionValidator ValidationExpression that checks that the first character must be Uppercase in a textbox ?

Posted 2-May-13 11:52am

Kurac1

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jkirkerx · Answer 1 · 2013-05-02T11:56:00

Solution 1

Actually, you just convert the first char if it's lower case using regex match and replace.

I don't see a reason to beg the user to capitalize the first char so you can validate it.

http://stackoverflow.com/questions/1668117/regex-how-to-uppercase-the-first-character-of-each-word[^]

The regex should work for validation as well, if not see below

http://stackoverflow.com/questions/8274562/regex-to-check-if-the-first-character-is-uppercase[^]

Posted 2-May-13 11:56am

jkirkerx

Updated 2-May-13 12:08pm

v2

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Kurac1 2-May-13 17:58pm

yeah i convert it yes , but even if i convert it when saving to database the first character are still lower case but in the view on the page its uppercase ?

jkirkerx 2-May-13 18:04pm

Your not saving from the buffer you made for conversion,

In other words, you make a buffer like a string or a class or structure, you make the swap, and send the buffer, class or structure to the program that saves the data.

In your program that saves the data, don't get your values from the objects such as textbox, get your values from your string, class or structure that has formatted data.

In other words, gather your raw data first from the textboxes, then process it as refined data, then save the refined data to the database.

Andreas Gieriet · Answer 2 · 2013-05-02T12:30:00

Solution 2

You might be interested in C# Regex: Supported Unicode General Categories[^].
There is a character class for upper case: \p{Lu] that matches any Unicode upper case (not only ASCII). The opposite of \p{Lu} is \P{Lu} (see upper case P), which means in the regex: all but the given class, i.e. all but upper case
E.g. error if the first character is not upper case:

C#

if (Regex.Match(input, @"^\P{Lu]").Success) { /*error...*/ }

Cheers
Andi

Posted 2-May-13 12:30pm

Andreas Gieriet

Comments

Sergey Alexandrovich Kryukov 2-May-13 19:12pm

5ed,
—SA

Andreas Gieriet 3-May-13 5:17am

Thanks for your 5!
Cheers
Andi

Kurac1 3-May-13 3:35am

i have tryed like this on button click but dont get any error and string input = TextBoxLanguages.Text;
if (Regex.Match(input, @"^\P{Lu]").Success)
{
LabelErrorLang.Visible = true;
LabelErrorLang.Text = "Börja med stor bokstav!";
}

Andreas Gieriet 3-May-13 5:17am

What happens if you enter AAA and what if you enter aaa?
Is the method triggered at all, i.e. are you sure that this code is compiled and executed?
Cheers
Andi

Andreas Gieriet 3-May-13 5:36am

To your original question: "how to write a ReguarExpressionValidator: see Validation in ASP.NET. This contains all the needed info to implement it in ASP.NET. Put the ValidationExpression="^\p{Lu}.*$" in the respective check. Note that the check now tells the positive pattern, i.e. begins with upper case is valid pattern. Please also note that in the expression, the whole string must be matched, namely, there is always an implicit leading ^ and trailing $ set by the system, therefore, you must give .* after the first character class in this pattern.
Cheers
Andi