What is the regex for isbn-10?

The regex pattern for isbn-10 is `^\d{9}[\dX]$`. This pattern validates isbn-10 — 9 digits plus a check digit (0-9 or x).

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^\d{9}[\dX]$/;` 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'^\d{9}[\dX]$', 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 (`/^\d{9}[\dX]$/i`) or use `re.IGNORECASE` in Python.

Regex for ISBN-10

Regex Pattern

^\d{9}[\dX]$

ISBN-10 — 9 digits plus a check digit (0-9 or X)

Quick Answer

The regex pattern for isbn-10 is `^\d{9}[\dX]$`. ISBN-10 — 9 digits plus a check digit (0-9 or X). This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
0306406152	✓ Matches
048665088X	✓ Matches
0131103628	✓ Matches
03064061521	✗ No match
030640615	✗ No match
ABCDEFGHIJ	✗ No match

Code Examples

javascript

const regex = /^\d{9}[\dX]$/;
const isValid = regex.test(value);

python

import re
pattern = r'^\d{9}[\dX]$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^\d{9}[\dX]$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^\d{9}[\dX]$/', $value)) {
    echo "valid";
}

java

String pattern = "^\\d{9}[\\dX]$";
boolean isValid = value.matches(pattern);

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