Regex to validate numbers

Question

Hi I am creating a regex to have:

• Numbers starting with 02 or +612
• Can have spaces
• Numbers starting with 02 to have 10 digits in total excluding space
• Numbers starting with +612 to allow + and 11 digits excluding space
• For numbers starting with +612, replace +61 with 0

Currently, I created

^(\+612)\d{8}$

Can anyone help me or suggest me how can I add the above validations in the regex.

Any help or suggestion would be appreciated.

Thanks in advance

Answer 1

You need to have an alternation that starts matching at two points and do the replacement afterwards:

^ *(?:0 *2|\+ *6 *1 *2)(?: *\d){8} *$

Live demo

JS code:

if (/^ *(?:0 *2|\+ *6 *1 *2)(?: *\d){8} *$/.test(phoneNumber)) {
    phoneNumber = phoneNumber.replace(/^ *\+ *6 *1/, 0);
}