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US Phone Number Format Regex

Validates 10-digit North American telephone numbers in formats like (123) 456-7890 or 123-456-7890.

Regular Expression Pattern:
/^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/
Valid Match Example:
(555) 234-5678
Invalid / Non-Match Example:
12345

Regex Syntax Breakdown & Explanation

  • •^\(?([0-9]{3})\)? : 3-digit area code with optional parentheses
  • •[-. ]? : Optional delimiter (hyphen, period, or space)
  • •([0-9]{3}) : 3-digit exchange code
  • •([0-9]{4})$ : 4-digit subscriber line number

Implementation in Popular Languages

JavaScript / TypeScript
const regex = /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/;
const isValid = regex.test("(555) 234-5678");
console.log(isValid); // true
Python (re)
import re

pattern = r"^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$"
match = re.match(pattern, "(555) 234-5678")
print(bool(match)) # True
Go (regexp)
package main
import (
  "fmt"
  "regexp"
)

func main() {
  re := regexp.MustCompile(`^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$`)
  fmt.Println(re.MatchString("(555) 234-5678"))
}
Frequently Asked Questions

Frequently Asked Questions

Everything you need to know regarding specifications, syntax, and security best practices.

The regular expression pattern is /^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/. Validates 10-digit North American telephone numbers in formats like (123) 456-7890 or 123-456-7890.