What is the regex for isbn-13?

The regex pattern for isbn-13 is `^97[89]\d{10}$`. This pattern validates isbn-13 — starts with 978 or 979, 13 digits total.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^97[89]\d{10}$/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r'^97[89]\d{10}$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

By default, yes. To make it case-insensitive, add the `i` flag in JavaScript (`/^97[89]\d{10}$/i`) or use `re.IGNORECASE` in Python.

Regex for ISBN-13

Regex Pattern

^97[89]\d{10}$

ISBN-13 — starts with 978 or 979, 13 digits total

Quick Answer

The regex pattern for isbn-13 is `^97[89]\d{10}$`. ISBN-13 — starts with 978 or 979, 13 digits total. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
9780306406157	✓ Matches
9791234567890	✓ Matches
9780131103627	✓ Matches
9760306406157	✗ No match
978030640615	✗ No match
97803064061571	✗ No match

Code Examples

javascript

const regex = /^97[89]\d{10}$/;
const isValid = regex.test(value);

python

import re
pattern = r'^97[89]\d{10}$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^97[89]\d{10}$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^97[89]\d{10}$/', $value)) {
    echo "valid";
}

java

String pattern = "^97[89]\\d{10}$";
boolean isValid = value.matches(pattern);

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