正则表达式中的有效电话号码

Question

I'am having some issues creating a regex to validate phone numbers. The validations that i need is the following:

has either 3 digits or between 7 and 12 digits (inclusive) - can have the optional '+' character in the beginning (before any digit) - can start with '00', in which case it shouldn't start with the '+' sign - if it starts with '00', these two digits don't count to the maximum number of digits - cannot have any letters - cannot have any symbol aside from the beginning '+' sign - cannot have any whitespace between the '+' sign and the first digit but can have any amount of whitespace in all other places

What I have is the following -> ^[+]{0,1}[-\\s/0-9]*$

Answer 1

I'd go with this:

^(\+|00)?(\d\s*){7,12}$

• ^ start of the string
• (\\+|00)? optional + or 00
• (\\d\\s*){7,12} a digit followed by zero or more spaces, 7 to 12 times
• $ end of string