Regular expression for no white space at start or end, but allow white space in middle, but also allow only one char inputs:

Question

Regular expression for no white space at start or end, but allow white space in middle, but also allow only one char inputs:

The closest I have got is : ^([^\\

Answer 1

Make everything after the first non-space character optional:

^(?=\S)[a-zA-Z0-9_\s-]*\S$