asp.net - Validation Expression for UserName using C# -

I am developing a login form with a username and password. I want users to create usernames in a specific format. So I'm using RegularExpressionValidator for the username, what is validation expression for this format.

format:

xyz \\ t4z4567 (characters are not case-sensitive)

Rules:

In the above format Username will be created

The first 5 letter (xyz) slash is identical for each user name.

Only "t4z4567" will be changed for every user.

Please provide me the solution.

Try this regular expression: "[a-zA-Z] {3} Based on your edit, it should be correct: \ d [a-zA-Z] \ d [a-zA-Z] \ d {4} "

P>

  "xyz \\\\ [a-zA-Z] \ d [a-zA] -jb] \ d {4}"  

this expression Believing the specific order of letters and numbers given in your example. If the last 6 digits can be all letters or digits, then this expression should be sufficient:

  "xyz \\\\ w {6}"