Regular-Expression Phone number validation with spaces and characters with minimun digits

Question

I have less skill for the Regex and I have a quick question. I need to validate phone number input with regEx.

Explanation/expression will be really appreciated. The Phone numbers can be any of the following formats:

(94) 123 345
(94).456.7899
(94)-456-7899
94-456-7899
+94 456 7899
94 456 7899
0094 456 7899
(94) 123
122 3454
1223454

1) Number can include spaces and characters or without characters.
2) It should have minimum 5 digits without spaces and characters. (I stuck at this point)

1st try

export const basicPhoneNumber = value =>
value && !/^\+?\d+$/i.test(value) 
? 'Invalid phone number' 
: undefined;

2nd try

  export const basicPhoneNumber = value =>
  value && !/\(?([0-9]{3})\)?([ .-]?)([0-9]{3})\2([0-9]{4,})/i.test(value) 
  ? 'Invalid phone number' 
  : undefined;

Thanks a lot for all your help and have a good one!

Answer 1

Phone number validation with regular expression is rather complicated, especially in such cases, yet we can try with an expression similar to:

^\+?\(?([0-9]{2,4})[)\s.-]+([0-9]{3,4})([\s.-]+([0-9]{3,4}))?$

which would likely fail with some desired instances that are not listed, regardless that some inputs such as (000) 000-0000 are not really phone numbers.

const regex = /^\+?\(?([0-9]{2,4})[)\s.-]+([0-9]{3,4})([\s.-]+([0-9]{3,4}))?$/gmi;
const str = `(94) 123 345
(94).456.7899
(94)-456-7899
94-456-7899
+94 456 7899
94 456 7899
0094 456 7899
(94) 123
122 3454`;
let m;

while ((m = regex.exec(str)) !== null) {
    // This is necessary to avoid infinite loops with zero-width matches
    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    
    // The result can be accessed through the `m`-variable.
    m.forEach((match, groupIndex) => {
        console.log(`Found match, group ${groupIndex}: ${match}`);
    });
}

Demo 1

Edit

For allowing 12234554, we would make an optional group for ([)\s.-]+)?,

^\+?\(?([0-9]{2,4})([)\s.-]+)?([0-9]{3,4})([\s.-]+([0-9]{3,4}))?$

Demo 2