I'm stuck trying to code a regex which match with those conditions:

• string with more than 9 digits
• string with more than 9 digits and letters

I can't figure out how to write my regex saying to it: digit or digit and letters can match but not letters.

Those string should match:

• 12345678987654567
• jhsjd4567hsqdgqsgh456786576567kj
• 9l8j9n9k0n9n8n

Those string should not match:

• loremipsum
• a1
• 12567

My regex so far: /(?:\w){9,}/

Thanks a lot :)

CodePudding user response：

I believe it should work

/([a-z]*[0-9][a-z]*){9,}/

CodePudding user response：

I am interpreting your requirements as: match a string of more than nine characters which contains either digits only or digits and letters only.

const tests = [
  '12345678987654567',
  'jhsjd4567hsqdgqsgh456786576567kj',
  '9l8j9n9k0n9n8n',
  'loremipsum',
  'a1',
  '12567',
];

for (const t of tests) {
  console.log(t.padEnd(35)  
    /^(?=.*\d)[a-z\d]{10,}$/i.test(t)
  )
}

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

The positive lookahead (?=.*\d) ensures that there is at least one digit in the string.

Remove the i flag if you want to match only lower-case letters.