enterprise library 5 - Validation with validation block -

i need write validation ms enterprise library. validation purpose validate string should have @ keyword @ atleast once , can have thing of 120 length, sure how it.

  <validator type="microsoft.practices.enterpriselibrary.validation.validators.containscharactersvalidator, microsoft.practices.enterpriselibrary.validation, version=6.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"                  characterset="@" containscharacter="any" name="contains characters validator" /> 

trying doesn't solve purpose.

or regex work..?

instead of using containscharactersvalidator, can use regexvalidator suitable regular expression.

if requirements are:

• @ anywhere in string, 0 many instances
• total string length between 1 , 120 characters
• other allowed characters alphanumeric only

then regex of [@a-za-z0-9]{1,120} should job you.