Regular expression for one word or group of words separated by one space?

Question

Regular Expressions

A regular expression for a single word or group of words separated by a single space.
Words cannot contain:
punctuation marks and other symbols

Answer 1

Indistinct condition, the answer is unlikely to help.
Well, for example, this fits what you wrote. But is the question asked correctly, that is the question.
^(\S+ )+(\S+$)?