Go (RE2)

International Phone (E.164) in GO

Validate phone numbers in ITU-T E.164 international format: a + sign followed by 2–15 digits, first digit non-zero.

Try it in the GO tester →

Pattern

regexGO
^\+[1-9]\d{1,14}$

Go (RE2) code

goGo
package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^\+[1-9]\d{1,14}$`)
	input := `+14155552671`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

How the pattern works

^ anchors the start. \+ matches the required leading plus sign. [1-9] ensures the country code starts with a non-zero digit. \d{1,14} allows 1 to 14 additional digits for a total of 2–15 digits after the +, per E.164 spec. $ anchors the end.

Examples

Input

+14155552671

Matches

  • +14155552671

Input

+442071838750

Matches

  • +442071838750

Input

14155552671

No match

—

Same pattern, other engines

JavaScript / ECMAScript

Supported

See how this pattern looks (and behaves) in JavaScript's built-in RegExp.

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

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