Validationflags: g

Credit Card Number

Match 16-digit credit card numbers with optional spaces or hyphens between groups of 4.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("\\b(?:\\d{4}[\\s\\-]?){3}\\d{4}\\b", "g");
const input = "4111 1111 1111 1111";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"\b(?:\d{4}[\s\-]?){3}\d{4}\b")
input_text = "4111 1111 1111 1111"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`\b(?:\d{4}[\s\-]?){3}\d{4}\b`)
	input := `4111 1111 1111 1111`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

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

Pattern

regexengine-agnostic

\b(?:\d{4}[\s\-]?){3}\d{4}\b   (flags: g)

Raw source: \b(?:\d{4}[\s\-]?){3}\d{4}\b

How it works

Three groups of 4 digits with optional space/hyphen separators, followed by a final 4-digit group. Word boundaries prevent partial matches.

Examples

Input

4111 1111 1111 1111

Matches

4111 1111 1111 1111

Input

4111-1111-1111-1111

Matches

4111-1111-1111-1111

Input

4111111111111111

Matches

4111111111111111

Common use cases

•PCI-DSS data discovery scans
•Detecting card numbers in logs (for masking)
•Payment form validation
•Data loss prevention (DLP) tools

Related patterns

ISBN-10

Validation

Match 10-digit ISBNs, allowing optional hyphens or spaces between groups.

ISBN-13

Validation

Match 13-digit ISBNs starting with 978 or 979, with optional hyphens or spaces.

International Phone Number (Loose)

Validation

Match international phone numbers in a variety of loose formats including country codes, area codes, and separators.

US Phone Number

Validation

Match US phone numbers in common formats: (555) 867-5309, 555-867-5309, 5558675309.

Related concepts

Word Boundaries: \b and \B

Concept

\b matches the position between a word character and a non-word character. It keeps your regex from matching 'cat' inside 'concatenate.'

How to Match Digits in Regex

How-to

Use \d for any digit, [0-9] for ASCII digits only, or {n} to match a specific count of digits. Combine with anchors for whole-string validation.

How to Match a Specific Number of Characters

How-to

Use {n} for exactly n, {n,} for n or more, {n,m} for between n and m. Apply to any single token — character, class, or group.

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All patterns

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