Regex to check a string contains just one word

Question

I was shown the following:

[RegularExpression(@"\b*[a-zA-Z0-9_]\b", ErrorMessage = "Enter a single work account name please")]

But it seems to give an error when a string contains more than one character. Can someone help with a Regex that checks if there is more than one word in a string?

Answer 1

^[a-zA-Z0-9_]+$

Word boundaries \b do not work here, as the pattern will match for each word.

If you want to allow non-Latin characters, you can use the shorthand version:

^\w+$

Answer 2

There was only missing one single piece to your regex

 @"^\b[a-zA-Z0-9_]+\b$"

you forgot to state that the character could be repeated more than 1 time. That's the reason for the plus sign, so that it may accept only 1 word