CODEWITHSUNDEEP
regex
TheDareback
TheDareback

Reputation: 407

How to create a regex with 13 characters and exact start?

Hello I have a problem create regular expression (phone number) for the following conditions:

the finally format must be: +421 xxx xxx xxx or +420 xxx xxx xxx

I've created something like this so far, but I have no idea how to proceed.

const regexPhone = /^\+[0-9]{12}/i;

Can you help me please?

Upvotes: 0

Views: 349

Answers (1)

anotherGatsby
anotherGatsby

Reputation: 1598

Regex patterns are often created on the basis of how the text 'looks', like in your example the numbers should look like "+420 xxx xxx xxx", so why not make regex for this exact format?

Try this: /^\+42[10] \d{3} \d{3} \d{3}$/

let pattern = /^\+42[10] \d{3} \d{3} \d{3}$/
let s = "+421 543 100 478"
console.log(pattern.test(s))

Now you can simplify the above regex to /^\+42[10]( \d{3}){3}$/

^             matches the start of the string
\+            matches +
42[10]        matches 42 followed by either 1 or 0
( \d{3}){3}   matches a space followed by three digits, this inturn is matched exactly three times
$             matches the end of the string

Upvotes: 1

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