Bad Compile constant value
c#
Solution
C# is trying to interpret `\d` as an escape sequence, and `\d` is not a valid escape sequence (but `\n` and `\t` are, for example). You can either double up the backslashes to escape it (`"^(\\d){4}$"`), or you can prefix the constant string with an at-sign: `@"^(\d){4}$"`.
Problem
I get "Bad Compile constant value" on this statement. ``` Regex objCheckNumber = new Regex("^(\d){4}$"); ``` I simply want to set this up to check another string to see if the value entered is 4 digits.