Question

i am having a problem creating a regular expression that will validate if the textbox has a three letters in the beginning and three numbers at the end e.g. AAA999 all 6 are required for this to be valid.

so far i have tried [A-Z][A-Z][A-Z][0-9][0-9][0-9] and [A-Z][A-Z][A-Z]\d{3}

can someone please tell me what i am doing wrong?

Answer 1

Add beginning and end anchors if you want the textbox to contain only 3 letters and 3 digits.

^[A-Z]{3}\d{3}$

Since you have C# tags, this is how code will look like in C#

Regex regexObj = new Regex(@"^[A-Z]{3}\d{3}$", RegexOptions.Multiline);
foundMatch = regexObj.IsMatch(subjectString);