🗂️ Telephone Number Validator 📞

➡️ Key Concepts :

✅ JavaScript, HTML & CSS

✅ regex

✅ regex.test( )

✅ addEventListener( )

✅ getElementById( )

ℹ️ In the US, phone numbers can be formatted in many ways. Here are some examples of valid formats for US phone numbers:

☎️ 1 555-555-5555

☎️ 1 (555) 555-5555

☎️ 1(555)555-5555

☎️ 1 555 555 5555

☎️ 5555555555

☎️ 555-555-5555

☎️ (555)555-5555

Note that the area code is required. Also, if the country code is provided, you must confirm that the country code is 1.