Pattern attribute HTML not matching regex

Question

So I have this line of code:

 <form> <input max="250" required pattern="[A-Za-z0-9 \.\,\?\:\:\[\]\(\)\"\-\+]+" class="inputBox" type="text" id="comment" name="CommentContent" placeholder="write here"> </form>

but it doesn't seem to match anything at all.

I got it to work for more simple regex but not for this one.

I used a site to validate it and it looks like it's valid.

Answer 1

Change the wrapping quote and don't escape the chars other than the []

 <form> <input max="250" required pattern='[A-Za-z0-9.,?::\[\]()"-+]+' class="inputBox" type="text" id="comment" name="CommentContent" placeholder="write here"> </form>