regular expression in c#

Question

I am trying to validate a texbox to allow numbers and letter(s) but not letters alone only e.g. 13492M

I am using C# regular expressions.

Answer 1

Simply,

Pattern = "^[a-zA-Z0-9]*[0-9]+[a-zA-Z0-9]*$"

Details :

• Start. ^
• Zero or more mixed alphanumerical. [a-zA-Z0-9]*
• One or more numerical. [0-9]+
• Zero or more mixed alphanumerical. [a-zA-Z0-9]*
• End. $

Answer 2

This Regex should work fine:

^[A-Za-z]*[0-9]+[A-Za-z]*$

This regex will allow numbers or letters+numbers. Just letters will fail.

Answer 3

How about this:

 ([0-9]+[a-zA-Z]+ | [a-zA-Z]+[0-9]+)[a-zA-Z0-9]*

(Numbers first and then alphabets OR Alphabets first then numbers) atleast once or more then both alphabets and numbers which is optional

Answer 4

^[A-Za-z]*\d[A-Za-z\d]*$ should do it. (Possibly some letters, then a digit, then any more letters or digits.)

(Edited to add start/end matches.)

Answer 5

use maskedTextBox, it use a property "mask" to validate with the Expression that you want. So you only add the RegEx to your maskedTextBox and you don't have to validate everytime in your code (it will check against your RegEx automatically)