Regular expression for validating name in asp net

Is Match(text, @" # Validate username with 5 constraints. # 1- only contains alphanumeric characters , underscore and dot.

:[abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKl MNOPQRSTUVWXYZ0123456789]))(?!

I replaced your submit button with a normal button and simplified out all the unneeded stuff for the example.

We've had similar issue in the past (as mentioned by Twee Zz).

Phone numbers are difficult to validate—especially when you take into consideration foreign area codes and phone number extensions.

Even if you ignore these problems and concentrate on U. phone numbers without extensions, many different formats still are used when entering a phone number.

:[abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKl MNOPQRSTUVWXYZ0123456789._]))(?!

You also can specify a minimum and maximum length for a password by using a regular expression that looks like this: This regular expression matches only expressions that are between 8 and 20 characters long.

The page in Listing 3.8 demonstrates how you can use this regular expression with option inline because the syntax for doing so with Java Script is different from the syntax for doing so with the . A not completely satisfactory workaround to this problem is illustrated by the page in Listing 3.9.

The This expression matches any entry (including spaces) that contains between 0 and 10 characters.

I want to validate an image path in File Upload, for any namea and for *.jpg, *and few more types.

)\.(jpg|JPG|jpeg|JPEG|bmp|BMP|gif|GIF|psd|PSD)$ But the problem is that expression identified all letter letters/characters.... Private Function Check File Type(By Val File Name As String) As Boolean Dim Ext As String = Path. To Lower()) Case (".jpg") Return (True) Case (".jpeg") Return (True) Case Else Return (False) End Select End Function No lol it dosen't work either for me.

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# 4- each time just one occurrence of underscore or dot is valid.

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