Regular expression which allow only characters or space

Question

I need help with regular expression.I need a expression in jquery which allows only character or space between two words. no double space allowed

I am using this

/^[a-zA-Z]+(-_ [a-zA-Z]+)*/

but it's not working.

Example space hello - not allowed

hello space - not allowed

hello space space hello - not allowed

space hello space - not allowed

hello1234 - not allowed

hello space 1234 - not allowed

---

hello world-allowed

hello-allowed

hello how are you-allowed

Answer 1

你可以用它

/^([a-zA-Z]+\s)*[a-zA-Z]+$/

Answer 2

I see you already have an accepted answer, but here's another, more concise option:

/^\w+( \w+)*$/

Starts with a word, then followed by any number of words with a single space in front.

Note that this accepts numbers in words too. I don't know if that's what you want.

Answer 3

这个RegEx对我有用（[A-Za-z] （） [A-Za-z] +）