International Phone Number with a + Sign

[Bilal Abdeen]

Thank you very much for the excellent library. I am trying to develop a mask for phone numbers. I managed to cover all cases for local (in Australia) phone numbers. However, I am struggling to handle the situation when the user enters an international phone number (starting with a + sign). I think handling validation for different international numbers would be pretty complex.

So, I thought of using a simple, minimal validation (\+)[1-9][0-9 \-\(\)\.]{7,32}:
If the 1st character is +, the user can enter any combination of (numbers, spaces, hyphens, dots, and/or parentheses). How can I code this into a mask function?

export const fMask = (text) => {
	// I NEED HELP WITH THE ALGORITHM FOR THIS CASE
	if (text?.startsWith("+")) {
		return [/(\+|00)[1-9][0-9 \-\(\)\.]{7,32}/]; // wrong
	}

	const onlyDigits = text?.replace(/\D+/g, "");

	// IMPORTANT: THE ORDER OF THE CONDITIONS BELOW IS IMPORTANT!

	// 0123
	// This condition is important to facilitate editing the number after typing it.
	// To fix: If the user starts typing a value that matches a mask, e.g. 02 123. Then, tries to delete what was entered. 
	if (onlyDigits?.length < 5) {
		return [/\d/, /\d/, /\d/, /\d/,];
 	}
	// 0444 222 333
	else if (onlyDigits?.startsWith("04")) {
	  return [/0/, /4/, /\d/, /\d/, ' ', /\d/, /\d/, /\d/, ' ', /\d/, /\d/, /\d/, ];
	}
	// 13 12 34, 18 12 34
	else if (onlyDigits?.length <= 6 && (onlyDigits?.startsWith("13") || onlyDigits?.startsWith("18"))) {
		return [/1/, /3|8/, ' ',	/\d/, /\d/, ' ',	/\d/, /\d/, ];
	}
	// 1300 123 567, 1800 123 567
	else if (onlyDigits?.length > 6 && (onlyDigits?.startsWith("13") || onlyDigits?.startsWith("18"))) {
		return [/1/, /3|8/, /0/, /0/,    ' ',    /\d/, /\d/, /\d/, ' ', /\d/, /\d/, /\d/, ];
	}
	// [phone]
	else if (onlyDigits?.startsWith("0")) {
	  return ['(', /0/, /\d/, ') ',     /\d/, /\d/, /\d/, /\d/, ' ', /\d/, /\d/, /\d/, /\d/, ];
	}
       // (2) 1234 5678	
       else {
	   return ['(', /\d/, ') ',   /\d/, /\d/, /\d/, /\d/, ' ', /\d/, /\d/, /\d/, /\d/, ];
	}
};

[Bilal Abdeen]

I found a solution.

	// I NEED HELP WITH THE ALGORITHM FOR THIS CASE
	if (text?.startsWith("+")) {
		// return [/(\+|00)[1-9][0-9 \-\(\)\.]{7,32}/]; // wrong

               // accepts a "+" sign followed by a maximum of 19 characters, each of which is a digit, a space, a dash, a dot or a parenthesis.
               return ['+', /[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,/[0-9 -().]/,];
	}