匹配包含以4位正则表达式结尾的特定子字符串的字符串

Question

I am trying to match the following type of string:

Match
- 4738
- 3333

No match
- 0447 7474
9495 - 8485
/2848
/ 9949
- 584888

so i made this regex: /^(- )?(?=\\d{4})$/ but this doesnt match my target string: - 8549
this is data i need to analyse:

I am quite new to regex so all tips and suggestions are welcome on how to fix this.

Thanks in advance

Answer 1

This should work:

/^(- )?(\d{4})$/

if you don't need to capture any groups:

/^(?:- )?\d{4}$/

Answer 2

如果您尝试/^-\\s\\d{4}$/ ，它应该可以解决问题;）