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Question

Answer 1

+3 A:

What about:

string input = "12345";
bool match = Regex.IsMatch(input, "^[a-z0-9]{1,5}$", RegexOptions.IgnoreCase);

Rubens Farias 2010-01-13 01:19:07

Without ^ and $, the regexp tester he gave me matched "12345" of "123456"; apparently that should be rejected though.

Carl Smotricz 2010-01-13 01:21:26

you're right carl, fixed

Rubens Farias 2010-01-13 01:22:50

And you were right about those other chars. I deleted my answer, thanks.

Carl Smotricz 2010-01-13 01:25:29

@Rubens, I am just wondering why didn't you include A-Z?

Jeffrey C 2010-01-13 01:27:55

@Jeffrey: I used RegexOptions.IgnoreCase, so will not differ a-z from A-Z (as OP said is working with C#). But you can remove it and to add A-Z if you wish

Rubens Farias 2010-01-13 01:29:53

Answer 2

+3 A:

How about

^[A-Za-z0-9]{1,5}$

S.Mark 2010-01-13 01:22:37

Answer 3

+3 A:

^[a-zA-Z0-9]{1,5}$

[a-zA-Z0-9] specifies the ranges allowed
^ specifies start of string
$ specifies end of string
{1,5} indicates minimum and maximum number of characters for the range

Darko Z 2010-01-13 01:22:38

You want to do `1,5` to catch strings shorter than 5 chars too, I think.

Carl Smotricz 2010-01-13 01:25:59

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