BIP-39 Mnemonic Phrase

Matches a BIP-39 mnemonic seed phrase — 12, 15, 18, 21, or 24 lowercase English words separated by single spaces.

✓ Wallet backup verification✓ Seed phrase format validation✓ Crypto onboarding

Test String

1 match

abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about
zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong

^^— ^ — start of string (or line in multiline mode)

(…){11,23}Group #1— Capturing group — captures matched text for reuse or extraction — repeated between 11 and 23 times · {11,23} — between 11 and 23 times

[…]+Character class […]— Matches any single character listed in this set — repeated one or more times (greedy) · + — one or more times (greedy)

\sspace— \s — whitespace (space, tab, newline…)

[…]+Character class […]— Matches any single character listed in this set — repeated one or more times (greedy) · + — one or more times (greedy)

a-za-z— a-z — range from 'a' to 'z'

$$— $ — end of string (or line in multiline mode)

Pattern: 25 charsInput: 143 chars

100% client-side · private

✓ Valid Examples

abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about
zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong

✗ Invalid Examples

abandon abandon
ABANDON ABANDON ABANDON
abandon double-space