Question

Can anyone help me create a regular expression that accepts alphanumeric (numbers and letters only) and dashes and white spaces.

It shouldn’t accept consecutive dashes and consecutive white spaces. or a dash followed by a white space and vice versa.
It should always begin and end with alphanumeric characters as well.

Thank you so much. Any help would be very much appreciated. (^-^)v

'Abcde' , '324 3a-32' : valid

'-' , '324 3a - 32' , '-2323  d-', 'z- -a' : invalid

---

Thanks guys for all your help. v(“,)\

Answer 1

Try this:

^[A-Za-z0-9]+(?:[\s-][A-Za-z0-9]+)*$

When the first [A-Za-z0-9]+ runs out of letters and digits, the [\s-] inside the group tries to match a hyphen or a whitespace character. If it succeeds, the second [A-Za-z0-9]+ tries to match some more alphanumerics. And the group gets repeated as many times as necessary.