问题
I am trying to write some form validation, I need one of the inputs to be 1-9999. I know nothing about regular expressions ( never used them before) and here is my first attempt
/^([1-9][1-9]|[1-9]|[1-9]\d|9999)$/
Does not seem to want to work, can anyone help me? Thanks!
回答1:
Try the below regex,
^(?:[1-9][0-9]{3}|[1-9][0-9]{2}|[1-9][0-9]|[1-9])$
DEMO
回答2:
This doesn't exclude zero, but /^\d{1,4}$/ should do the trick.
回答3:
Try using this
^([1-9]|[1-9][0-9]|[1-9][0-9][0-9]|[1-9][0-9][0-9][0-9])$
回答4:
This Regex should not match numbers that start with 0 a part from 0
Regex: /^(?!(0\d))\d{1,4}$/
Regex (Exclude Zero): /^(?!(0))\d{1,4}$/
Test: https://regex101.com/r/zfCKel/2
来源：https://stackoverflow.com/questions/24914114/regex-1-9999-for-form-validation