正则表达式匹配字符串中任意位置的一定数量的数字

Question

I'm trying to use angular's ng-pattern attribute to enforce that the text in an input box matches a particular regular expression. I'm doing this for form validation. The input I'm using this on is a phone field. The phone field can accept 10 digit phone numbers but I don't want to require a specific format from my users other than it must contain a 10 digit number in there somewhere. So these would both be valid.

• 555-555-5555
• (555) 555-5555

On the backend, I would just remove all formatting and store the raw digits. In the past for this what I've done is to remove all non-numeric characters and then just made sure the length == 10. It's simple enough to do in a couple of lines of code, but is it something regular expressions can handle? This isn't something I've ever tried to make a regular expression do. I don't want to support specific formats because I don't care if they accidentally enter an extra space or if they want to type their phone number like this: 55-55-55-55-55. It really doesn't matter to me, I just want the regex to match if there are 10 digits and no more somewhere in the string.

Thanks for the help guys!

Answer 1

To allow just 10 digits in a string with a regex, no more no less, you can use

^(?:\D*\d){10}\D*$

See demo ( \\D replaced with [^\\d\\n] to exclude newline for demo only).

The (\\d\\D*?){10} regex will find the match in a string with more than 10 digits.

Answer 2

^(?!(?:.*?\d){11,})[^a-zA-Z\n]+$

Try this.See demo.

https://regex101.com/r/iQ4nW0/1

Answer 3

您可以为它创建属性类型指令，并使用动态正则表达式设置有效性。