Question

I want to use .NET’s Regex.IsMatch function to determine if a string is 8 characters long and matches the expression AK-\d\d\d\d[fF]. So, AK-9442F would match but not AK-9442F2 nor AK-9442. How would I construct the expression?

Answer 1

Using the static Regex.IsMatch, you can do:

if (Regex.IsMatch(myTestString, @"^AK-\d{4}[fF]$")) {
  // passed
}

Should work for your purpose. Broken down, it’s:

^       # must match beginning of the string
  AK-     # string literal, "AK-"
  \d{4}   # \d is digit, {4} means must be repeated 4 times
  [fF]    # either upper or lowercase F
$       # must match end of string

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