Go (RE2)

TCP/UDP Port Number in GO

Match port numbers (1–65535) following a colon, as you'd find in host:port strings.

Try it in the GO tester →

Pattern

regexGO
:(6553[0-5]|655[0-2]\d|65[0-4]\d{2}|6[0-4]\d{3}|[1-5]?\d{1,4})\b   (flags: g)

Go (RE2) code

goGo
package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`:(6553[0-5]|655[0-2]\d|65[0-4]\d{2}|6[0-4]\d{3}|[1-5]?\d{1,4})\b`)
	input := `http://localhost:8080`
	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

The alternation enforces the 0–65535 range. Requires a leading colon for context, followed by a word boundary.

Examples

Input

http://localhost:8080

Matches

  • :8080

Input

db.example.com:5432

Matches

  • :5432

Input

api:65535

Matches

  • :65535

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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