Please note that special characters are not allowed

javascript validation, special characters are not allowed except ‘-‘ and ‘_’ [closed]

This question appears to be off-topic because it lacks sufficient information to diagnose the problem. Describe your problem in more detail or include a minimal example in the question itself.

First, im not a pro in javascript so please bear with me.

I need to create a validation where user is not allowed to enter any special character except ‘-‘ and ‘_’ (exampe : ‘.’, ‘/’ and ‘@’ is not allowed).

I have tried to google and i know i can achieve this easily using javascript’s REGEX. However, im not allowed to use REGEX, so i need to code it without using REGEX.

I dont want to manually validate each special character, so please help me out.

Thanks for your time.

3 Answers 3

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So in this assignment, you’re:

Not allowed to use regular expressions, and

Not allowed to «manually» (whatever that means) validate each «special character» (whatever that means)

I assume restriction #2 means you can’t compare each character to a specific list, for instance, in a switch statement.

With that starting point, assuming you’ve been given some sort of definition of what a «special» character is, you should be able to write the code.

Certain special characters are not allowed in the URL entered into the address bar of Internet Explorer

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Symptom

When you use the address bar of Internet Explorer 6.0 or later to enter a username and password to access an FTP site, and the format of the URL you enter is ftp://username:password@domain, the following error message is displayed:

Windows cannot find ‘ ftp://username:password@domain’. Check the spelling and try again.

Cause

Either the username or the password contains any one of the characters:

This behavior is by design.

Resolution

If the username or password needs to contain any one of the characters listed in the Cause section, you will need to encode the special characters in the following way:

More Information

Consider the following example.

A user with the username «jdoe» and a password of «Sure?» who wants to access an FTP site on a server called «ftpserver».

When the user tries to access the site using Internet Explorer and enters ftp://jdoe:Sure?@ftpserver into the address bar, the access will fail and the error message described above will be displayed.

However, when the user enters ftp://jdoe:Sure%3F@ftpserver in the address bar, he or she will successfully access the FTP server.

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How do I not allow special characters, but allow space in regex?

I need to populate an error message when the user is entering special characters within a datagridview. as of now I have the following:

this regex works, and does not allow special character, however it is falls in the if statement if there is a space between characters, which should be allowed.

How do I make it to allow a space, but not special characters?

5 Answers 5

Trending sort

Trending sort is based off of the default sorting method — by highest score — but it boosts votes that have happened recently, helping to surface more up-to-date answers.

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I think you just want to add a space to your regular expression:

When writing regular expressions it is generally a good habit to use the verbatim string operator @ as many of the special expressions require you to use a backslash character.

If you were explicitly telling the regular expression to ignore whitespace in the pattern you would then need to escape the space character.

If you wanted them to be able to use any whitespace characters (spaces, tabs, newlines, etc.), you could use the whitespace character class \s

Update

It appears that you may have wanted to a regular expression that excluded characters in a group.

But if you wanted to write an excluded group of characters in your regular expression you can put a ^ in your group. When the ^ is inside of a group [^] any characters that come after it are excluded from the match.

The regular expression [A-Z] would match any character A-Z. The regular expression [^A-Z] would match any character NOT A-Z.

If that is what you were looking for you could change your statement to:

This statement will match any string that contains any character not in the group. So if they type «Hello World» it would not match. If they typed «Hello! World» it would match because «!» is not in the group.

Why special characters are not allowed in SQL table column name?

I created a table and named one of the columns as 50″ the SQL accepted it but later when I right click on the table then click on «edit top 200 rows» the SQL Management studio stuck and stops working and closes.

However I still can edit other tables which don’t have special characters in their column name. It sounds like the » is not allowed in column name? Any idea how can I include » in column name?

2 Answers 2

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That said, you do not want to have such names in your database. The use of square braces (in SQL Server, other databases have different escape mechanisms) just clutters up queries, making them harder to write and to read.

Why does SQL have such limitations? Well, in fact, it is a computer language and all computer languages (I think) have such limitations. For instance, an unescaped space is not allowed in a variable name in any language I can think of (some exceptions will be noted in the comments ;).

SQL could pretty easily allow more characters in names (for instance, I don’t think

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not valid, special characters are not allowed

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Неверно; специальные символы не разрешены

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children are not allowed in.

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Детям вход воспрещён.

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are not allowed

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are not allowed.

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pets are not allowed

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pets are not allowed

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Домашние животные запрещены

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pets are not allowed

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pets are not allowed

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Размещение домашних животных не допускается.

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pets are not allowed

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Домашние животные не разрешены

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pets are not allowed in a suite.

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Домашние питомцы не разрешены в номере свит.

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pets are not allowed in the hotel.

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Проживание в отеле с животными запрещено.

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pets are not allowed in the hotel.

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Размещение с домашними животными запрещено.

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pets are not allowed in the restaurant.

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Вход в ресторан с домашними животными запрещен.

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pets are not allowed in the restaurant.

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Животные в ресторан не допускаются

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pets are not allowed.

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pets are not allowed.

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pets are not allowed.

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В апартаменты нельзя привозить животных.

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pets are not allowed.

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В коттеджах «poiju villat» нельзя размещаться с домашними животными.

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pets are not allowed.

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Возможно размещение с домашними животными до 5 кг.

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pets are not allowed.

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Домашние животные не допускается.

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pets are not allowed.

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Животные не допускаются.

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