html表单正则表达式模式验证

Question

I have been searching google for some time but cannot get my html pattern validation to work correctly :(

I have 2 phone fields in my form - home and mobile - which I am trying to use pattern="" to validate. However the regex is difficult and I don't really understand how this works.

The requirements are as follows:

A mobile phone number number should:

• begin with 07.
• be 10 or 11 characters in length
• not begin with 070 or 076

Home phone numbers must only begin with 01 or 02 or 03.

Answer 1

Mobile phones: 07[12345789]\\d{7,8}

Home phones: (01|02|03)\\d+

If there are the same length restrictions for home phones, then instead of \\d+ you have to use \\d{8,9}