pattern for regular expression that will eliminate empty string

Question

I am using zurb foundation and I would like avoid to submit answer consist only with empty spaces.

how can I write pattern that will allow all letters, numbers, spaces and signs (, ; . !) but will not pass empty string fr " "

this one is ok but works only for one word:

<textarea placeholder=""  id="answer-add" required  pattern="^[a-zA-Z0-9]+$"></textarea>

Answer 1

如果您要避免的唯一事情是获得一串空格，则可以使用以下命令：

<textarea placeholder=""  id="answer-add" required  pattern="^[^\s]*$"></textarea>