Regex to validate textbox length

I have this RegEx that validates input (in javascript) to make sure user didn't enter more 开发者_运维问答than 1000 characters in a textbox:

^.{0,1000}$

It works ok if you enter text in one line, but once you hit Enter and add new line, it stops matching. How should I change this RegEx to fix that problem?

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The problem is that . doesn't match the newline character. I suppose you could use something like this:

^[.\r\n]{0,1000}$

It should work (as long as you're not using m), but do you really need a regular expression here? Why not just use the .length property?

Obligatory jwz quote:

Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.

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Edit: You could use a CustomValidator to check the length instead of using Regex. MSDN has an example available here.

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What you wish is this:

/^[\s\S]{0,1000}$/

The reason is that . won't match newlines.

A better way however is to not use regular expressions and just use <text area element>.value.length

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If you just want to verify the length of the input wouldn't it be easier to just verify the length of the string?

if (input.length > 1000)
    // fail validation